Ian Wienand 4c86706e5e docs: reorganise around a open infrastructure overview
This introduces and "Open Infrastructure" page which is designed for a
moderately experienced developer with some understanding of Zuul,
Ansible and basic Linux admin skills to have an entrypoint to
navigating the system-config and related repositories.

It is designed to re-enforce the idea of open infrastructure, and
explain how development, testing and production come together at a
level high enough to be understood, but with links or descriptions of
specific places in the code to get started.

It moves a little of what was in the sysadmin page into this, and
leaves that page as more low-level descriptions of various tasks.

Change-Id: I60a9299df455b98ad549ac0075a59d381722bc06
2022-03-04 12:18:42 +11:00
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