migrate to decoupled Blowfish layout, fix TOC scrollspy, and update docs

- Theme Decoupling & Cleanup:
      - Fully decoupled and vendored the Blowfish theme directly into root directories (layouts/,
  assets/, static/, data/, i18n/).
      - De-registered and cleaned up legacy Git submodules (themes/blowfish, themes/hugo-admonitions)
  from the Git index to protect the build from upstream breakages.
      - Configured .gitignore to ignore development preview symlinks (content, static,
  config/_default/menus.en.toml), build folders (public/, resources/), and locks.

    - TOC & Layout Fixes:
      - Replaced the custom layouts/_default/single.html template with the Blowfish default to restore
  native container widths and the side-by-side flex layout.
      - Restored TOC to float on the right sidebar on desktop viewports and render inline on mobile
  viewports.
      - Fixed a parameter resolution bug in layouts/partials/toc.html by checking both .Site.Params.
  smartTOC and .Site.Params.article.smartTOC (where it is defined in params.toml).
      - Upgraded the TOC scrollspy JavaScript to target all '#TableOfContents' containers on the page,
  enabling highlight tracking on both desktop and mobile layouts.

    - Documentation Updates (README.md):
      - Restored YAML front matter metadata block at the top.
      - Added detailed notes on the CI/CD build process and Gitea runner deployment targets
  (/srv/www/docs-public and /srv/www/docs-private).
      - Added a categorized and sorted "Shortcodes Quick Reference" table at the top of the shortcodes
  section (ordered by Custom, Hugo Default, and Blowfish).
      - Documented custom shortcodes (Include, Screenshot, Raw HTML) and missing Hugo default
  shortcodes (Highlight, Instagram, Param, Ref, Relref, Twitter, Vimeo, Youtube).
      - Restructured headings to ensure all sub-shortcodes are H3, removed block break tags (<br/>),
  and appended horizontal separators (---) after H2 sections.

layouts/partials/author-links.html

@@ -0,0 +1,21 @@
+{{ with .Site.Params.Author.links }}
+  <div class="flex flex-wrap text-neutral-400 dark:text-neutral-500 space-x-2">
+    {{ range $links := . }}
+      {{ range $name, $url := $links }}
+        {{ $isEmail := eq $name "email" }}
+        <a
+          class="{{ cond $isEmail "email-link" "" }} hover:text-primary-700 dark:hover:text-primary-400"
+          href="{{ cond $isEmail "#" ($url | safeURL) }}"
+          {{ if eq $name "email" }}
+            data-email="{{ $url | base64Encode }}"
+          {{ end }}
+          target="_blank"
+          aria-label="{{ $name | title }}"
+          title="{{ $name | title }}"
+          rel="me noopener noreferrer"
+          ><span class="inline-block align-text-bottom">{{ partial "icon.html" $name }}</span></a
+        >
+      {{ end }}
+    {{ end }}
+  </div>
+{{ end }}