top bar: Update colors and add link to forge

docs/_static/custom.css

@@ -35,12 +35,12 @@ a {
 
 .swh-top-bar a,
 .swh-top-bar a:visited {
-    color: #fecd1b;
+    color: white;
 }
 
 .swh-top-bar a.swh-current-site,
 .swh-top-bar a.swh-current-site:visited {
-    color: #e20026;
+    color: #fecd1b;
 }
 
 .swh-donate-item {

docs/_templates/layout.html

@@ -4,13 +4,16 @@
   <div class="swh-top-bar">
     <ul>
       <li>
-        <a href="https://www.softwareheritage.org">Project</a>
+        <a href="https://www.softwareheritage.org">Home</a>
       </li>
       <li>
-          <a href="https://archive.softwareheritage.org">Archive</a>
+        <a href="https://archive.softwareheritage.org">Archive</a>
       </li>
       <li>
-          <a class="swh-current-site" href="https://docs.softwareheritage.org/devel/">Documentation</a>
+        <a href="https://forge.softwareheritage.org/">Development</a>
+      </li>
+      <li>
+        <a class="swh-current-site" href="https://docs.softwareheritage.org/devel/">Documentation</a>
       </li>
       <li class="swh-donate-item">
         <a class="swh-donate-link" href="https://www.softwareheritage.org/donate/">Donate</a>