Bug#877367: www.debian.org: Please consider adding redirects for old Policy chapters/appendices

[Rebecca N. Palmer]

This breaks the (6 according to codesearch [0]) links from Developers' 
Reference to specific Policy sections.

[0] 
https://codesearch.debian.net/search?q=package%3Adevelopers-reference+url-debian-policy%3Bch-