Release/support roadmap in documentation

Is your feature request related to a problem?

I can not find easily info on the release cycle, python versions support, when they would be dropped, etc.
It's handy to know e.g. how long would python 3.11 be supported by xarray.

Describe the solution you'd like

We could add a new page in the documentation, similar to Development roadmap, but targeting users.
Say, "Release Roadmap", with info on:

• release cycle
• when support (=releases) would cease for a given python version

I understand the release cycle isn't on strict schedule, but then we could mention that, or what the project is striving to achieve.

Describe alternatives you've considered

I have been looking around the project but did not find an overview. If I missed it, my apologies. Let me know :)

Additional context

Nowadays I work on hardening xarray-based workflows for production.
Some of the target systems are rigid.
When designing new systems, it is important to get the python version/env right the first time.
And for aging in-place systems, to plan the update wisely.

Start by reading the existing Development roadmap page linked in the issue and inspect the surrounding documentation structure. Define the release cycle and Python-version support policy, including when support ends, then add a user-facing Release Roadmap page with those details and clear caveats about scheduling.