RFR: Section on project maintenance [v6]

Tue Dec 20 12:57:29 UTC 2022

> * New section on project maintenance
> * New infographics on push/defer during rampdown
> * Moved JDK Release Process section to follow the Release Note section
> * Minor fixes

Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:

  Minor clarification around jtreg.

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Changes:
  - all: https://git.openjdk.org/guide/pull/92/files
  - new: https://git.openjdk.org/guide/pull/92/files/b4ac25ab..32bb1318

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=92&range=05
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=92&range=04-05

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/guide/pull/92.diff
  Fetch: git fetch https://git.openjdk.org/guide pull/92/head:pull/92

PR: https://git.openjdk.org/guide/pull/92