Remove redundant packages concept document

The packages concept came from the old wiki. It more or less duplicates the content listed in the "Platform APIs and Services" architectural document, but also lists a number of packages that have long since been removed from Apertis. Perform a quick tidy up, moving any potentially useful/relevant information to the architectural document and deleting the packages page.

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