Use docusaurus for the site

[emmatown]

A custom site isn't useful here, we just need a thing that will put some markdown files on a website and have it look decent and docusaurus looks to do that.

[changeset-bot]

⚠️ No Changeset found

Latest commit: d27dc67

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[codecov]

Codecov Report

Merging #478 (d27dc67) into main (3930466) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
+ Coverage   92.04%   92.11%   +0.06%     
==========================================
  Files          32       32              
  Lines        1459     1459              
  Branches      409      409              
==========================================
+ Hits         1343     1344       +1     
+ Misses        111      110       -1     
  Partials        5        5              

Impacted Files	Coverage Δ
packages/cli/src/build/config.ts	82.35% <0.00%> (+1.47%)	⬆️

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