[PATCH] Redirect from old HACKING GUIDE that shows up as Nr.2 in Google search, to current Community Guide

The current Community Guide doesn't turn up in Google searches for 'svn
hacking guide' because the document is now called 'Apache Subversion
Community Guide (aka "HACKING")', whereas before it was called 'Hacking
Guide'.

https://www.google.co.uk/search?q=svn+hacking+guide&oq=svn+hacking+guide&aqs=chrome..69i57.5847j0j7&sourceid=chrome&es_sm=93&ie=UTF-8&qscrl=1

The first link is correctly redirected but the second link points to an
outdated version.

[[[
Add redirection to point to the current version of the Apache
Subversion Community Guide to old HACKING GUIDE branch because it
turns up in position 2 when searching Google for 'svn Hacking Guide'.

* subversion/branches/take2/www/hacking.html
   (meta): Redirect to current Community Guide.

]]]

Gabriela