Clean up docs

[techknowlogick]

• Add documentation on how to add analytics
• Make sure to say the version that themes were added in
• Fix Confusing docs for IMPORT_LOCAL_PATHS #5074

[codecov-io]

Codecov Report

Merging #5274 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #5274      +/-   ##
=========================================
- Coverage   37.63%   37.6%   -0.03%     
=========================================
  Files         310     310              
  Lines       46054   46054              
=========================================
- Hits        17331   17320      -11     
- Misses      26246   26254       +8     
- Partials     2477    2480       +3

Impacted Files	Coverage Δ
models/repo_indexer.go	44.49% <0%> (-3.82%)	⬇️
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️

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