Before this commit, the "Developer/Misc" directory of the doc, and
more particularly the "Developer/Misc/Other" sub-directory, was used as
a garbage dump where we moved all the pages that didn't fit elsewhere.
Due to that, interesting and important pages, such as the Coding
Guidelines, were buried in that directory never to be read again by Odoo
developers.
This commit moves most pages under "Misc" one or two levels up to be
located directly under "Developer" hence making them more accessible. A
new "Contributing/Development" directory is added to host the Coding
Guidelines page and soon many other pages.
task-2897143
closesodoo/documentation#2337
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
