docs: vendor images, add FAQ + Cookbook hub, group changelog

A round of structural and durability fixes spanning the whole site.

Vendored images
- 80 external github.com/user-attachments images downloaded into
  docs/public/img/ and all references rewritten to /img/<uuid>.<ext>.
  Those URLs were attached to GitHub issues and could vanish at any
  time; the docs no longer depend on them.
- ~44 MB added under docs/public/img/.

New pages
- development/index.md: Cookbook landing page that maps the whole
  Cookbook by category (Core, Data Patterns, Interactions,
  Specifics) and ends with a "stuck?" block. Sidebar entry "Cookbook"
  now points here instead of to the Controller page.
- resources/faq.md: 18 recurring questions in five sections
  (Getting Started, Architecture and Comparisons, Production,
  Customization, Community), each linking to the page that answers
  in detail. Wired into the Resources sidebar.

Restructured pages
- resources/changelog.md: 29 releases regrouped under H2 by year
  (2025, 2024) with H3 per release. Date stays inline with the
  version; entries listed newest first. Adds a short header
  explaining the version scheme.

Polish
- index.md: feature cards reworked from {Guide, GitHub, LinkedIn}
  to {Quickstart, Cookbook, Behind the Scenes, Glossary, GitHub,
  LinkedIn} so the landing page surfaces the actual key paths.
- get_started/use_cases.md: dropped LinkedIn-blog "complete
  overview" dependency in favor of inline tier-model framing.
- Decorative emojis removed (lock, rocket, heart) from
  technology/rap.md, technology/ui5.md, resources/who_uses.md.
  Functional indicators (✅ ❌ ⚠️) in tables are kept.

All internal doc links audited — no broken targets.

https://claude.ai/code/session_011kvL4ihgqWYQa2SSufEaKv

Author: claude

docs/.vitepress/config.mjs

@@ -60,7 +60,7 @@ export default defineConfig({
         text: "Guide",
         items: [
           { text: "Introduction", link: "/get_started/about" },
-          { text: "Cookbook", link: "/development/general" },
+          { text: "Cookbook", link: "/development/" },
           { text: "Configuration", link: "/configuration/checklist" },
           { text: "Advanced Topics", link: "/advanced/downporting" },
           { text: "Technical Insights", link: "/technical/concept" },
@@ -114,9 +114,10 @@ export default defineConfig({
       },
       {
         text: "Cookbook",
-        link: "/development/general",
+        link: "/development/",
         collapsed: true,
         items: [
+          { text: "Overview", link: "/development/" },
           { text: "Controller", link: "/development/general" },
           { text: "View", link: "/development/view" },
           {
@@ -289,6 +290,7 @@ export default defineConfig({
         items: [
           { text: "Add-ons", link: "/resources/addons" },
           { text: "Samples Index", link: "/resources/samples_index" },
+          { text: "FAQ", link: "/resources/faq" },
           { text: "References", link: "/resources/references" },
           { text: "Who Uses abap2UI5?", link: "/resources/who_uses" },
           { text: "Releases", link: "/resources/changelog" },