ci: auto-sync GitHub wiki module pages from man pages

Add tooling that makes the scdoc man pages the single source of truth and
regenerates the wiki module pages from them:

- .github/wiki/mapping.json: man-page -> wiki-page mapping (aggregation-aware)
- .github/wiki/generate.py: scdoc -> pandoc -> gfm, strips man-only sections,
  concatenates aggregated pages, appends optional extras/<Page>.md
- .github/wiki/extras/: hand-kept appendices (screenshots) with no man equivalent
- .github/workflows/wiki.yml: on push to man/** (or the tooling), regenerate
  and push the wiki; other wiki pages are left untouched

Covers all 65 man pages -> 45 wiki pages (5 new: GPS, Inhibitor, Mango, Menu,
WWAN). Non-module and hand-written wiki pages are never modified.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/wiki/extras/Module:-Clock.md

@@ -0,0 +1,3 @@
+## Screenshots
+
+![calendar](https://github.com/Alexays/Waybar/assets/6098822/e5c38984-6b3c-43ef-8cac-05122a078d58)

.github/wiki/extras/Module:-Hyprland.md

@@ -0,0 +1,6 @@
+## Screenshots
+
+![](https://user-images.githubusercontent.com/25804378/270065881-acef7b73-e528-4648-82c1-ba70ea9f7804.png)
+![Workspace taskbars example](https://github.com/user-attachments/assets/c5387d8b-6612-442a-83af-2a0d881fa6db)
+![image](https://github.com/Alexays/Waybar/assets/1778670/6421e9ce-50be-4086-8045-688338d5fbe7)
+![image](https://github.com/Alexays/Waybar/assets/1778670/48c58198-aae4-42ac-802a-33b1e3db5e33)