fix version in footer linking to git sha instead of release tag

archivebox/legacy/templates/index.html

@@ -210,7 +210,7 @@
             <center>
                 <small>
                     Archive created using <a href="https://github.com/pirate/ArchiveBox" title="Github">ArchiveBox</a>
-                    version <a href="https://github.com/pirate/ArchiveBox/commit/$git_sha" title="Git commit">$version</a> &nbsp; | &nbsp; 
+                    version <a href="https://github.com/pirate/ArchiveBox/tree/v$version" title="Git commit">v$version</a> &nbsp; | &nbsp; 
                     Download index as <a href="index.json" title="JSON summary of archived links.">JSON</a>
                     <br/><br/>
                     $footer_info