Add details about different build targets.
Remove veewee/vagrant provisioning files.
Fix distribution name.
Remove obsolete instructions.
Remove obsolete documentation.
Remove obsolete documentation.
Remove obsolete documentation about technical details.
Remove obsolete development plans.
Update building instructions.
Replace build instructions with pointer to doc/building.md.
Update details about goals.
Remove customization instructions for 3.2.x kernels.
Remove obsolete parts from version naming docs.
Remove obsolete packaging documentation.