index.md: clarify staging instructions

The staging instructions are confusing and hard to follow. Make them a
little more straightforward to follow and remove extra fluff.

Additionally, document some oddities about LAVA, the sanity check
process, and big jobs.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I365a117873ecb0a3752fd26046e75988884f24f2
2 files changed
tree: 866ce6ef1e89ca512f6e58da556a85f63528b034
  1. docs/
  2. .gitreview
  3. mkdocs.yml
  4. requirements.txt