RFR: Section on project maintenance

Wed Sep 21 10:02:27 UTC 2022

On Wed, 21 Sep 2022 08:48:17 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> * 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

Nice. Some minor comments.

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Changes requested by lujaniuk (no project role).

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