Add bookmarklet

static/index.html

@@ -34,6 +34,10 @@
         You can also get a particular post's original plain-text body at <code>/project_name/post_id/</code>, such as
         <a href="/noracodes/169186/"><code>/noracodes/169186/</code></a>. (In a Cohost post URL, the ID is the numerical part after <code>/post/</code>.
         For instance, in <code>https://cohost.org/noracodes/post/169186-october-update</code>, the ID is "169186".)
+
+        Or, drag this bookmarklet: <a href="javascript:(function(){const regex = /^https:\/\/cohost.org\/([a-zA-Z_0-9]*)\/post\/([0-9]*)-.*/;const new_loc = window.location.href.replace(regex, 'https://corobel.nora.codes/$1/$2');window.open(new_loc);})()">
+          Cohost: Extract Source
+        </a> to your bookmarks bar and then click on it when you're on a Cohost individual post page to download that post's source.
     </p>
     <p>
         Webfinger resources for accounts are provided at the Webfinger well-known URL <code>/.well-known/webfinger?project_name</code>.