docs(website): dedicated page per bundled + optional skill (#14929)

Generates a full dedicated Docusaurus page for every one of the 132 skills
(73 bundled + 59 optional) under website/docs/user-guide/skills/{bundled,optional}/<category>/.
Each page carries the skill's description, metadata (version, author, license,
dependencies, platform gating, tags, related skills cross-linked to their own
pages), and the complete SKILL.md body that Hermes loads at runtime.

Previously the two catalog pages just listed skills with a one-line blurb and
no way to see what the skill actually did — users had to go read the source
repo. Now every skill has a browsable, searchable, cross-linked reference in
the docs.

- website/scripts/generate-skill-docs.py — generator that reads skills/ and
  optional-skills/, writes per-skill pages, regenerates both catalog indexes,
  and rewrites the Skills section of sidebars.ts. Handles MDX escaping
  (outside fenced code blocks: curly braces, unsafe HTML-ish tags) and
  rewrites relative references/*.md links to point at the GitHub source.
- website/docs/reference/skills-catalog.md — regenerated; each row links to
  the new dedicated page.
- website/docs/reference/optional-skills-catalog.md — same.
- website/sidebars.ts — Skills section now has Bundled / Optional subtrees
  with one nested category per skill folder.
- .github/workflows/{docs-site-checks,deploy-site}.yml — run the generator
  before docusaurus build so CI stays in sync with the source SKILL.md files.

Build verified locally with `npx docusaurus build`. Only remaining warnings
are pre-existing broken link/anchor issues in unrelated pages.

website/docs/user-guide/skills/bundled/email/email-himalaya.md

@@ -0,0 +1,293 @@
+---
+title: "Himalaya — CLI to manage emails via IMAP/SMTP"
+sidebar_label: "Himalaya"
+description: "CLI to manage emails via IMAP/SMTP"
+---
+
+{/* This page is auto-generated from the skill's SKILL.md by website/scripts/generate-skill-docs.py. Edit the source SKILL.md, not this page. */}
+
+# Himalaya
+
+CLI to manage emails via IMAP/SMTP. Use himalaya to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
+
+## Skill metadata
+
+| | |
+|---|---|
+| Source | Bundled (installed by default) |
+| Path | `skills/email/himalaya` |
+| Version | `1.0.0` |
+| Author | community |
+| License | MIT |
+| Tags | `Email`, `IMAP`, `SMTP`, `CLI`, `Communication` |
+
+## Reference: full SKILL.md
+
+:::info
+The following is the complete skill definition that Hermes loads when this skill is triggered. This is what the agent sees as instructions when the skill is active.
+:::
+
+# Himalaya Email CLI
+
+Himalaya is a CLI email client that lets you manage emails from the terminal using IMAP, SMTP, Notmuch, or Sendmail backends.
+
+## References
+
+- `references/configuration.md` (config file setup + IMAP/SMTP authentication)
+- `references/message-composition.md` (MML syntax for composing emails)
+
+## Prerequisites
+
+1. Himalaya CLI installed (`himalaya --version` to verify)
+2. A configuration file at `~/.config/himalaya/config.toml`
+3. IMAP/SMTP credentials configured (password stored securely)
+
+### Installation
+
+```bash
+# Pre-built binary (Linux/macOS — recommended)
+curl -sSL https://raw.githubusercontent.com/pimalaya/himalaya/master/install.sh | PREFIX=~/.local sh
+
+# macOS via Homebrew
+brew install himalaya
+
+# Or via cargo (any platform with Rust)
+cargo install himalaya --locked
+```
+
+## Configuration Setup
+
+Run the interactive wizard to set up an account:
+
+```bash
+himalaya account configure
+```
+
+Or create `~/.config/himalaya/config.toml` manually:
+
+```toml
+[accounts.personal]
+email = "you@example.com"
+display-name = "Your Name"
+default = true
+
+backend.type = "imap"
+backend.host = "imap.example.com"
+backend.port = 993
+backend.encryption.type = "tls"
+backend.login = "you@example.com"
+backend.auth.type = "password"
+backend.auth.cmd = "pass show email/imap"  # or use keyring
+
+message.send.backend.type = "smtp"
+message.send.backend.host = "smtp.example.com"
+message.send.backend.port = 587
+message.send.backend.encryption.type = "start-tls"
+message.send.backend.login = "you@example.com"
+message.send.backend.auth.type = "password"
+message.send.backend.auth.cmd = "pass show email/smtp"
+```
+
+## Hermes Integration Notes
+
+- **Reading, listing, searching, moving, deleting** all work directly through the terminal tool
+- **Composing/replying/forwarding** — piped input (`cat << EOF | himalaya template send`) is recommended for reliability. Interactive `$EDITOR` mode works with `pty=true` + background + process tool, but requires knowing the editor and its commands
+- Use `--output json` for structured output that's easier to parse programmatically
+- The `himalaya account configure` wizard requires interactive input — use PTY mode: `terminal(command="himalaya account configure", pty=true)`
+
+## Common Operations
+
+### List Folders
+
+```bash
+himalaya folder list
+```
+
+### List Emails
+
+List emails in INBOX (default):
+
+```bash
+himalaya envelope list
+```
+
+List emails in a specific folder:
+
+```bash
+himalaya envelope list --folder "Sent"
+```
+
+List with pagination:
+
+```bash
+himalaya envelope list --page 1 --page-size 20
+```
+
+### Search Emails
+
+```bash
+himalaya envelope list from john@example.com subject meeting
+```
+
+### Read an Email
+
+Read email by ID (shows plain text):
+
+```bash
+himalaya message read 42
+```
+
+Export raw MIME:
+
+```bash
+himalaya message export 42 --full
+```
+
+### Reply to an Email
+
+To reply non-interactively from Hermes, read the original message, compose a reply, and pipe it:
+
+```bash
+# Get the reply template, edit it, and send
+himalaya template reply 42 | sed 's/^$/\nYour reply text here\n/' | himalaya template send
+```
+
+Or build the reply manually:
+
+```bash
+cat << 'EOF' | himalaya template send
+From: you@example.com
+To: sender@example.com
+Subject: Re: Original Subject
+In-Reply-To: <original-message-id>
+
+Your reply here.
+EOF
+```
+
+Reply-all (interactive — needs $EDITOR, use template approach above instead):
+
+```bash
+himalaya message reply 42 --all
+```
+
+### Forward an Email
+
+```bash
+# Get forward template and pipe with modifications
+himalaya template forward 42 | sed 's/^To:.*/To: newrecipient@example.com/' | himalaya template send
+```
+
+### Write a New Email
+
+**Non-interactive (use this from Hermes)** — pipe the message via stdin:
+
+```bash
+cat << 'EOF' | himalaya template send
+From: you@example.com
+To: recipient@example.com
+Subject: Test Message
+
+Hello from Himalaya!
+EOF
+```
+
+Or with headers flag:
+
+```bash
+himalaya message write -H "To:recipient@example.com" -H "Subject:Test" "Message body here"
+```
+
+Note: `himalaya message write` without piped input opens `$EDITOR`. This works with `pty=true` + background mode, but piping is simpler and more reliable.
+
+### Move/Copy Emails
+
+Move to folder:
+
+```bash
+himalaya message move 42 "Archive"
+```
+
+Copy to folder:
+
+```bash
+himalaya message copy 42 "Important"
+```
+
+### Delete an Email
+
+```bash
+himalaya message delete 42
+```
+
+### Manage Flags
+
+Add flag:
+
+```bash
+himalaya flag add 42 --flag seen
+```
+
+Remove flag:
+
+```bash
+himalaya flag remove 42 --flag seen
+```
+
+## Multiple Accounts
+
+List accounts:
+
+```bash
+himalaya account list
+```
+
+Use a specific account:
+
+```bash
+himalaya --account work envelope list
+```
+
+## Attachments
+
+Save attachments from a message:
+
+```bash
+himalaya attachment download 42
+```
+
+Save to specific directory:
+
+```bash
+himalaya attachment download 42 --dir ~/Downloads
+```
+
+## Output Formats
+
+Most commands support `--output` for structured output:
+
+```bash
+himalaya envelope list --output json
+himalaya envelope list --output plain
+```
+
+## Debugging
+
+Enable debug logging:
+
+```bash
+RUST_LOG=debug himalaya envelope list
+```
+
+Full trace with backtrace:
+
+```bash
+RUST_LOG=trace RUST_BACKTRACE=1 himalaya envelope list
+```
+
+## Tips
+
+- Use `himalaya --help` or `himalaya <command> --help` for detailed usage.
+- Message IDs are relative to the current folder; re-list after folder changes.
+- For composing rich emails with attachments, use MML syntax (see `references/message-composition.md`).
+- Store passwords securely using `pass`, system keyring, or a command that outputs the password.