docs: github community standard

[davidlhw]

closes #151

pending:

• [x] populate DEVELOPMENT.md
• [x] populate DEPLOYMENT.md
• [x] populate ARCHITECTURE.md
• [x] populate PHILOSOPHY.md
• [x] update various READMEs
• [x] add some common PULL_REQUEST_TEMPLATEs
• [x] add some ADRs (Any Decision Records)

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