Improve patch view visuals

- underline in commit hover state
- indent revision comments
- dim "Revision" text in header
- fix vertical alignment of header items in right-hand-side
- don't show first revision description, it's already shown as part of the
  patch description

Signed-off-by: Rūdolfs Ošiņš <rudolfs@osins.org>

src/components/Thread.svelte

@@ -66,7 +66,7 @@
   }
 </style>
 
-<div class="comment" style:margin-top="1rem">
+<div class="comment">
   <CommentComponent
     {rawPath}
     id={root.id}