docs: add diagrams section

[akshayka]

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Remove mermaid, stat from layout and put them in diagrams

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 14, 2024 11:20pm
marimo-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 14, 2024 11:20pm

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8a18849) 64.25% compared to head (57ec1e0) 64.25%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #568   +/-   ##
=======================================
  Coverage   64.25%   64.25%           
=======================================
  Files         130      130           
  Lines        6370     6370           
  Branches     1285     1285           
=======================================
  Hits         4093     4093           
  Misses       2096     2096           
  Partials      181      181           

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