add rss link to side panel

tools/page_shares.py

@@ -9,6 +9,7 @@ HEAD_EMBED = """
 <ul class="nav">
 <li><a href="/">main page</a></li>
 <li><a href="https://git.poto.cafe/veclavtalica/mjestecko">source</a></li>
+<li><a href="/feed.xml">rss</a></li>
 <li><a href="/articles/mjestečko.html">about</a></li>
 </ul>