Migrate the 'About this site' page to Hugo

The `index.html` file was renamed to `_index.html` as per Hugo's
conventions: Otherwise no other page could live in the same directory.

Signed-off-by: Victoria Dye <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>

Author: vdye

app/views/site/about.html.erb content/site/_index.htmlapp/views/site/about.html.erb renamed to content/site/_index.html

@@ -1,3 +1,10 @@
+---
+section: "site"
+url: /site.html
+aliases:
+- /site/index.html
+---
+
 <div id="main">
   <h1>About git-scm.com</h1>