docs: Add v2022.1 release notes

[blocktrron]

This is still unfinished and will most likely not render correctly in ReadTheDocs.

But let's have a first cycle so we can push this through very soon.

Contains changes up to b851354

[rotanid]

there are some mentions of Github Issues/PRs in those release notes, but only as numbers, i guess we should hyperlink them

[herbetom]

once #2611 and #2584 are merged the release notes probably should reference those sections

[T-X]

Should the removal of the bridge multicast wakeup call feature and potential downsides for Android users be mentioned?

[T-X]

There should be a mention that this Gluon release now uses OpenWrt 22.03.0-rc6+.

[blocktrron]

@T-X I've included the Bridge-Wakeup regression as "Known Bug", can you have a look?

[AiyionPrime]

We talked about how we'd warn in the docs about the lacking WG key migration in the last meetup in case we didn't merge #2601 in time.

@blocktrron Do you want that in the known bugs section too? Or somewhere else?

[blocktrron]

@AiyionPrime key migration is a feature, neither a bug nor a regression

[AiyionPrime]

So somewhere else. Where?

Nevermind:
https://github.com/freifunk-gluon/gluon/pull/2609/files#diff-ebab738940b40bddd7078d94b7a18f95c6367d9e677ab656136526d4d161ce9dR283-R288

[AiyionPrime]

Looks really nice by now. Only minor stuff from my side;
I have now opinion on whether or not to use points at the end of sentences in listings, but maybe let's make it consistent.

The rocket should be marked in the right category and that doubling of currently being developed should be gone in some way.

[rotanid]

i worked through the open remarks.
i also added R6020 which was added to master branch in the meantime.

one thing i'm wondering though:
have you removed the old known issues from this RN on purpose? @blocktrron

[blocktrron]

Added release notes and incorporated suggestions.

[herbetom]

The changes from b851354 onward shouldn't be forgotten.

b851354...master

[AiyionPrime]

Minor fixes, reads good overall.
Have not looked into whether something is missing though.

[T-X]

Just noticed one more thing for the release, https://gluon.readthedocs.io/en/master/user/getting_started.html#building-the-images, there the "Replace RELEASE with the version you’d like to checkout, e.g. v2021.1." might need an update, too?

[herbetom]

@T-X it's part of the relase proccess to change that https://github.com/freifunk-gluon/gluon/wiki/Release-Process