Clean up dependencies

[peterfpeterson]

This reduces the dependencies included in the system and cleans up the build script.

The contents of the conda package are unchanged from next, but that should be independently confirmed.

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.77%. Comparing base (bed8fac) to head (f141f65).

Additional details and impacted files

@@           Coverage Diff           @@
##             next      #14   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
=======================================
  Files          60       60           
  Lines        3524     3524           
=======================================
  Hits         2776     2776           
  Misses        748      748           

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[KyleQianliMa]

checked locally and all looks good to me