feat: add docs links to setup wizard sections (#5283)

Each setup step now shows a link to the relevant docs page:
- Model & Provider → integrations/providers
- Terminal Backend → developer-guide/environments
- Agent Settings → user-guide/configuration
- Messaging Platforms → user-guide/messaging (overview)
- Telegram, Discord, Matrix, Mattermost, WhatsApp → per-platform guides
- Tools → user-guide/features/tools

Existing Slack and Webhook URLs migrated to shared _DOCS_BASE constant.

hermes_cli/tools_config.py

@@ -1336,6 +1336,7 @@ def tools_command(args=None, first_install: bool = False, config: dict = None):
     print(color("⚕ Hermes Tool Configuration", Colors.CYAN, Colors.BOLD))
     print(color("  Enable or disable tools per platform.", Colors.DIM))
     print(color("  Tools that need API keys will be configured when enabled.", Colors.DIM))
+    print(color("  Guide: https://hermes-agent.nousresearch.com/docs/user-guide/features/tools", Colors.DIM))
     print()
 
     # ── First-time install: linear flow, no platform menu ──