Move our process document into the reference guide published on the
website so it is easier to provide folks with links to explain the
various stages of the cycle.
Adding the new page also requires fixing up some RST warnings so
Sphinx would run properly, and fixing some markup so the rendered page
looked OK.
Change-Id: If6280b60b8802d3908c233a30547ec442cb2804e
Signed-off-by: Doug Hellmann <doug@doughellmann.com>