Site: the devlog, the blog's roro9stack posts in the site's style; Devlog replaces Blog in the navigation

Seven posts imported into site/content/devlog/ with their text unchanged,
links between them pointing to /devlog/, and shortcodes (sign, cast, steps,
asides, folded sections, diagrams, captions) restyled in the site's palette.
The 17 inline SVG diagrams carried <style> blocks and style attributes the
site's Content-Security-Policy refuses: their rules moved to
devlog-diagrams.css, and a diagram's minimum width is a class. An Atom feed
at /devlog/atom.xml.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

site/templates/base.html

@@ -31,7 +31,7 @@
     <a href="/install/">Install</a>
     <a href="/guide/">Guide</a>
     <a href="/downloads/">Downloads</a>
-    <a href="{{ config.extra.blog }}">Blog</a>
+    <a href="/devlog/">Devlog</a>
     <button class="link-btn js-only" id="theme-toggle" type="button">Light</button>
     <a class="btn btn-primary n-md" href="{{ config.extra.repo }}">Source</a>
   </nav>
@@ -50,7 +50,7 @@
         <a href="{{ config.extra.repo }}/releases">Releases</a>
         <a href="{{ config.extra.repo }}/src/branch/main/docs">Docs in the repository</a>
         <a href="{{ config.extra.repo }}/issues">Issues</a>
-        <a href="{{ config.extra.blog }}">Blog</a>
+        <a href="/devlog/">Devlog</a>
         <a href="mailto:{{ config.extra.contact }}">Contact</a>
       </nav>
     </div>