docs: add v2023.2 release notes

[skorpy2009]

No description provided.

[T-X]

Maybe add a section to name the new OpenWrt, Linux kernel mac80211-backports like we had for v2022.1? Also the (potentially, if most nodes were updated) new handling of IPv6 multicast packets with a routable address, enabled due to the newer Linux kernel/bridge version, migh be worth mentioning. Suggestion:

Major changes
-------------

OpenWrt
~~~~~~~

This release is based on the newest OpenWrt 23.05 release branch. It ships with Linux kernel 5.15, wireless-backports 6.1.24 and batman-adv 2023.1. 

...

Minor changes
-------------

batman-adv
~~~~~~~~~~

If enough nodes are updated then the batman-adv multicast optimizations originally introduced in Gluon 2021.1 for link-local IPv6 multicast addresses will then be applied within the domain to routable IPv6 multicast addresses, too.

[blocktrron]

Updated to contain all changes introduced up to 32256ef

[herbetom]

Linking PRs to changes would have been a nice touch.

Might not work everywhere but at least for some parts. I think it can help demystifying stuff and helps quickly understanding changes/context when the Release Notes might be unintentionally lacking some Infos.

[blocktrron]

@neocturne I can not comment on your remark about the removed device support. I've updated this section accordingly.

[herbetom]

@blocktrron I can't see any upated commits?

[skorpy2009]

@neocturne yes please just push in here :)

[neocturne]

I have pushed 3 commits with suggested changes.

[herbetom]

2023 is over. I would propose renaming this release to v2024.1.

[skorpy2009]

2023 is over. I would propose renaming this release to v2024.1.

No

[blocktrron]

In case anyone wants to refactor everything, go ahead. I'll not be the one bikeshedding this further.

[neocturne]

I can take care of the renaming if we want to switch to 2024.1.

[2tata]

I can take care of the renaming if we want to switch to 2024.1.

I can help as well.