gitweb: shortlog template: removed excessive whitespace, added title bar.
The title bar is currently empty, this is just a preparation for filling it
with content.
#header#
<title>Mercurial repositories index</title>
</head>
<body>
<h2>Mercurial Repositories</h2>
The specified repository "#repo|escape#" is unknown, sorry.
Please go back to the main repository list page.
#footer#