Streamline adding a new dataset

[frankier]

• Add instructions to README for adding a new dataset
• Add scripts to update the dataset metadata
• Add update_doc method to only add a single dataset
• Add HTML documentation generation to update_doc
• Change update_doc to correctly round trip quotes in the metadata CSV

[frankier]

Partially addresses #47 (comment) and #127 which both mention wanting further instruction on how to add a dataset.

[codecov-commenter]

Codecov Report

Base: 83.33% // Head: 81.48% // Decreases project coverage by -1.85% ⚠️

Coverage data is based on head (ebcbfef) compared to base (b1a5959).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   83.33%   81.48%   -1.86%     
==========================================
  Files           3        3              
  Lines          24       27       +3     
==========================================
+ Hits           20       22       +2     
- Misses          4        5       +1     

Impacted Files	Coverage Δ
src/dataset.jl	85.71% <66.66%> (-5.20%)	⬇️

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