feat(docs): show per-skill pages in the left sidebar (#26646)

Individual skill pages (e.g. /docs/user-guide/skills/bundled/productivity/notion)
had no sidebar rendered — the sidebar config only listed the two catalog index
pages. That was an intentional choice from an earlier 'too many entries would
drown product docs' concern, but the effect is that a user landing on any skill
page (via search, share link, or the catalog table) loses navigation entirely
and can't see related skills.

Wire build_sidebar_items() (which was already computed and discarded) back into
the sidebar. Structure:

  Skills
  ├── Bundled skills catalog       (catalog table, was already there)
  ├── Optional skills catalog      (catalog table, was already there)
  ├── Bundled
  │   ├── apple/
  │   │   ├── apple-apple-notes
  │   │   └── ...
  │   └── ... (one collapsed category per skill category)
  └── Optional
      └── ... (same)

Categories are collapsed by default so the top-level Skills entry doesn't
explode visually. Users browsing one skill see siblings in the same category;
the catalogs remain the at-a-glance entry point.

Also includes drift the regen script naturally produces on top of current main:
- creative-comfyui v5.0.0 → v5.1.0 page (author + new ref file)
- devops-kanban-worker SKILL.md updates
- new pages for optional skills that lacked generated docs:
  hyperliquid, finance-stocks, software-development/rest-graphql-debug
- updated optional-skills-catalog row for those

Validation:
- npx docusaurus build (en locale) succeeded — only pre-existing warnings
- inspected built productivity-notion/index.html: sidebar tree present,
  sibling productivity skills (airtable, linear, etc.) all linked

website/docs/user-guide/skills/bundled/creative/creative-comfyui.md

@@ -16,8 +16,8 @@ Generate images, video, and audio with ComfyUI — install, launch, manage nodes
 |---|---|
 | Source | Bundled (installed by default) |
 | Path | `skills/creative/comfyui` |
-| Version | `5.0.0` |
-| Author | ['kshitijk4poor', 'alt-glitch'] |
+| Version | `5.1.0` |
+| Author | ['kshitijk4poor', 'alt-glitch', 'purzbeats'] |
 | License | MIT |
 | Platforms | macos, linux, windows |
 | Tags | `comfyui`, `image-generation`, `stable-diffusion`, `flux`, `sd3`, `wan-video`, `hunyuan-video`, `creative`, `generative-ai`, `video-generation` |
@@ -42,6 +42,12 @@ for workflow execution.
 - `official-cli.md` — every `comfy ...` command, with flags
 - `rest-api.md` — REST + WebSocket endpoints (local + cloud), payload schemas
 - `workflow-format.md` — API-format JSON, common node types, param mapping
+- `template-integrity.md` — converting `comfyui-workflow-templates` from
+  editor format to API format: Reroute bypass, dotted dynamic-input keys
+  (`values.a`, `resize_type.width`), Cloud quirks (302 redirect, 1 concurrent
+  free-tier job, 1080p VRAM ceiling), Discord-compatible ffmpeg stitch.
+  Authored by [@purzbeats](https://github.com/purzbeats). Load this whenever
+  you're starting from an official template.
 
 **Scripts (`scripts/`):**