add versioning to docs build action

[edward-io]

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Summary:

• removes unit tests from doc build (tests still run on PR and commit in the unit_test action)
• instead of the files being stored directly, move to master directory. when tnt gets a full release, a stable symlink can point to the directory of the latest version (e.g. 0.0.3/).

Test plan:

https://github.com/edward-io/tnt/tree/gh-pages

Fixes #{issue number}

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[codecov[bot]]

Codecov Report

Merging #244 (7ae1306) into master (7c921bc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #244   +/-   ##
=======================================
  Coverage   89.43%   89.43%           
=======================================
  Files          81       81           
  Lines        4837     4837           
=======================================
  Hits         4326     4326           
  Misses        511      511           

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