Fix docs

[mileslucas]

• remove LiveServer.jl from docs environment
• remove NestedSamplers.jl from docs environment
• fix printing at end of docs examples
• add Crayons to docs
• add unlisted docstrings to API section

[codecov]

Codecov Report

Merging #67 (dbb710a) into main (9c79a9c) will not change coverage.
The diff coverage is n/a.

❗ Current head dbb710a differs from pull request most recent head debd3af. Consider uploading reports for the commit debd3af to get more accurate results

@@           Coverage Diff           @@
##             main      #67   +/-   ##
=======================================
  Coverage   89.98%   89.98%           
=======================================
  Files          12       12           
  Lines         529      529           
=======================================
  Hits          476      476           
  Misses         53       53           

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