adding simple sample menu and heading style and footer blurb

[webgit] / webgit_skins / default / inc / header.inc

<div id="banner">Webgit</div>
<ul id="main-menu">
  <li><a href="/">Home</a></li>
  <li><a href="/about">About</a></li>
  <li><a href="/community">Community</a></li>
  <li><a href="/install">Install</a></li>
</ul>