Site: download and Gitea icons on the hero links [skip ci]

The Gitea mark is its logo's two cup paths in the link color.

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

site/src/style.css

@@ -66,6 +66,13 @@ button:focus-visible {
   gap: 1.5rem;
 }
 
+a.icon svg {
+  height: 1em;
+  width: auto;
+  margin-inline-end: 0.35em;
+  vertical-align: -0.125em;
+}
+
 .stage {
   display: block;
   max-width: 100%;