The developer documentation contains a number of documents that are
duplicated from the wiki. Remove the duplications, ensuring the remaining
copies are up-to-date.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

Martyn Welch authored 4 years ago and Emanuele Aina committed 4 years ago

More of the guides still seem relevant and good information. Tweak the
formatting and move these to guides.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>