* Move source control documentation to docs repository
* Add instructions for referencing issues in commit messages
* Split out monolithic jiri doc into smaller docs

Change-Id: I171e933aaac70b758ea9f290fb4339a5f0532a4a

Collateral cleanup:

* Simplify some links.

* Link to the raw build instructions.

* Break lines so that source code is more readable in an editor.

Change-Id: Id49bbb44e177461f1fe2d24e3e4e4bda12490500

Change-Id: I5eefcb42e54a62afd3f6bc997ec45f64d52fb51e

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Change-Id: I98ccae056093d75f05c70337d54057cb16a8f3b0

Change-Id: Idd6a46ecdade5c069bdd406516d13fc4a25be642

This will serve as an entry point to browse various topics about the OS.

Change-Id: If0cdcb5ca4f8125e6734032b9e94f7086b34eb63

Change-Id: Ibdae7b906e660170ea163d042922ae602435bf12

Change-Id: I9e9ed933a7d6f46bcd709fb839478a6804eca626

- turns out that dart_app does exist;
- known issue was fixed.

Change-Id: Idd62068645a0b6baf6ef4a1060057d9de5afcded

Change-Id: Id28a5cf4dcb8de9b2983bde02e8d48ae57d23b4a

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