gitweb: preserve whitespace in description
Without this, multiple spaces or tabs in the commit message aren't
preserved and things like tables don't align properly.
As part of adding the CSS rule, we had to cuddle the content
with the <div> to not introduce leading and trailing whitespace.
The "addbreaks" filter was also removed because it would insert
an additional newline, effectively double spacing content.
Differential Revision: https://phab.mercurial-scm.org/D113
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<link rel="icon" href="{staticurl|urlescape}hgicon.png" type="image/png" />
<meta name="robots" content="index, nofollow"/>
<link rel="stylesheet" href="{staticurl|urlescape}style-monoblue.css" type="text/css" />
<script type="text/javascript" src="{staticurl|urlescape}mercurial.js"></script>