fix link in stagit-index, update documentation, add TODO

stagit.1

@@ -17,9 +17,11 @@ to the current directory. The following files will be written:
 Atom XML feed
 .It files.html
 List of files in the latest HEAD commit, linking to the file.
-.It log.html
+.It log/HEAD.html
 List of commits in order of most recent to old of the commits (top to bottom),
 each commit links to a page with a diff and diffstat of the commit.
+.It refs.html
+Lists references of the repository such as branches and tags.
 .El
 .Pp
 For each file in HEAD a file will be written in the format: