feat(cli): Add shtab completions, remove unused code

[tony]

• shtab.FILE completions
• Remove unused click code

[codecov]

Codecov Report

Merging #834 (43d167e) into master (43d167e) will not change coverage.
The diff coverage is n/a.

❗ Current head 43d167e differs from pull request most recent head c272bf9. Consider uploading reports for the commit c272bf9 to get more accurate results

@@           Coverage Diff           @@
##           master     #834   +/-   ##
=======================================
  Coverage   75.03%   75.03%           
=======================================
  Files          19       19           
  Lines        1602     1602           
  Branches      359      359           
=======================================
  Hits         1202     1202           
  Misses        290      290           
  Partials      110      110           

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