Docs cleanup

[adam-urbanczyk]

• Remove roadmap
• Separate Workplane page
• Mention selectors as a separate concept
• mention zenodo
• add citation.cff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (29fbe38) to head (b3a3aec).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1736   +/-   ##
=======================================
  Coverage   95.33%   95.33%           
=======================================
  Files          28       28           
  Lines        6842     6842           
  Branches     1025     1025           
=======================================
  Hits         6523     6523           
  Misses        194      194           
  Partials      125      125           

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[adam-urbanczyk]

No real new content, but just some restructuring and cleanup (removed roadmap).

[jmwright]

Thanks @adam-urbanczyk !