Mesa 2.1.1 updates to tutorials for CSSSA tutorial and history update

[tpike3]

• update README screenshot
• add Colab badge to intro tutorial
• update visualization tutorial so it references git install of mesa-models

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (f1e3e97) 72.29% compared to head (b7bce4e) 72.35%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1744      +/-   ##
==========================================
+ Coverage   72.29%   72.35%   +0.05%     
==========================================
  Files          20       20              
  Lines        1303     1302       -1     
  Branches      246      246              
==========================================
  Hits          942      942              
+ Misses        326      325       -1     
  Partials       35       35              

Files Changed	Coverage Δ
mesa/__init__.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[rht]

I'm not a Tufte expert, but the new one has a high "data-to-ink" ratio. But:

1. it doesn't show the current selected number of agents.
2. it doesn't showcase a Jupyter notebook analysis.

For point 2, not sure it is necessary, given that the visualization tutorial already showcase it. But this is meant to be a screenshot that shows people as much context as possible.

[tpike3]

I'm not a Tufte expert, but the new one has a high "data-to-ink" ratio. But:

1. it doesn't show the current selected number of agents.
2. it doesn't showcase a Jupyter notebook analysis.

For point 2, not sure it is necessary, given that the visualization tutorial already showcase it. But this is meant to be a screenshot that shows people as much context as possible.

I went back and forth on how to update it, in the end the I went with just a screenshot of the visualization as it has substantially less information to process, but that did make me realized I need to update the caption and I can put the jupyter notebook context in there. I will also update so it included the number of agents