feat: point Robotex readers to the Redmine guest account

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

layouts/projects/single.html

@@ -118,7 +118,7 @@
     <section class="section" id="community">
       <div class="wrap">
         <h2>{{ .title }}</h2>
-        <p class="section__lead">{{ .lead }}</p>
+        <p class="section__lead">{{ .lead | markdownify }}</p>
         <div class="grid grid--4">
           {{ range .links }}
           <a class="card card--link" href="{{ .href }}" target="_blank" rel="noopener">