docs: Redwood release notes first cut.

[feoh]

Necessary changes for the OpenEdX Redwood release.

Fixes: https://github.com/openedx/wg-build-test-release/issues/377

Built version on ReadTheDocs

Replaces https://github.com/openedx/docs.openedx.org/pull/503 which died due to a Github branching mishap.

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[feoh]

@feoh I have a ton of suggestions in the doc. Can you please go through them?

Sorry about the delay I had a bit of a medical thing today. The joys of aging :) I THINK I've addressed all of them. Please feel free to ping me on Slack if I'm being even more blind than usual and missed something!

[sarina]

Sorry about the delay I had a bit of a medical thing today. The joys of aging :)

Haha absolutely no worries, since you had requested a re-review I wasn't sure if they were showing up for you.

[sarina]

I added a bunch of formatting fixes because the rendered document had a lot of misaligned bullets and headers. Committed them so we can try to get these out for today's release!

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