Move development guides to `guides/`

The following guides can be moved to `guides/` with minimal changes:

- buildingpatchingandmaintainingtheapertiskernel.md
- gitlab-based_packaging_workflow.md
- howtobuildyourownkernel.md
- howtodevelopondevices.md
- logging.md

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