Readthedocs: Add version switch and update URL

[EwoutH]

This does two things:

• Add version switch to choose between the stable and latest docs
• And update the URLs to the shorter mesa.readthedocs.io/stable (instead of mesa.readthedocs.io/en/stable)

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -0.0% [-0.9%, +0.8%]	🔵 +0.1% [-0.1%, +0.2%]
BoltzmannWealth	large	🔵 -0.0% [-0.3%, +0.3%]	🔵 -0.0% [-0.7%, +0.6%]
Schelling	small	🔵 +0.3% [-0.0%, +0.7%]	🔵 +0.0% [-0.2%, +0.2%]
Schelling	large	🔵 -0.1% [-0.5%, +0.2%]	🔵 +2.4% [+1.2%, +3.6%]
WolfSheep	small	🔵 +0.3% [+0.1%, +0.5%]	🔵 +1.2% [+1.1%, +1.4%]
WolfSheep	large	🔵 -0.3% [-1.2%, +0.4%]	🔵 -1.2% [-4.4%, +1.3%]
BoidFlockers	small	🔵 +2.2% [+1.7%, +2.6%]	🔵 +0.2% [-0.7%, +0.9%]
BoidFlockers	large	🔵 +1.8% [+1.3%, +2.2%]	🔵 -0.1% [-0.6%, +0.3%]

[EwoutH]

Only way to test this is to merge and deploy on the main branch, since the switch URL points to that. Let's go!

[Corvince]

Wait, did you just nuke all existing links out there? 😅 If you want to do that they must at least redirect. If that's not possible please revert this :)

[EwoutH]

No, I would never do that! I think I figured it out, can you check if it works on your side? https://mesa.readthedocs.io/en/latest/tutorials/visualization_tutorial.html

[Corvince]

Haha, good one, I fell for that...

You just got me worried because I only tested https://mesa.readthedocs.io/en/stable and that gives a 404. But the other links seem to redirect correctly.

[EwoutH]

Couldn't not do it ;)

That one now also works, I was redirecting /en/stable/*, now /en/stable*