Retemplate the repository

[wtbarnes]

Fixes #145
Fixes #150
Fixes #129
Fixes #149
Fixes #153

Retemplate the repository to make things a bit easier to install and package

• Update install instructions
• Double check that all above issues are resolved
• Test only on 3.9 and above
• Update CI scripts to use tox
• Change "master" to "main" in CI scripts

[codecov]

Codecov Report

Attention: 88 lines in your changes are missing coverage. Please review.

Comparison is base (7a484dc) 41.71% compared to head (45c1c73) 66.85%.
Report is 18 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #158       +/-   ##
===========================================
+ Coverage   41.71%   66.85%   +25.14%     
===========================================
  Files          10       11        +1     
  Lines         489      694      +205     
===========================================
+ Hits          204      464      +260     
+ Misses        285      230       -55     

Files	Coverage Δ
pydrad/__init__.py	100.00% <100.00%> (ø)
pydrad/configure/__init__.py	100.00% <100.00%> (ø)
pydrad/configure/filters.py	96.55% <100.00%> (+0.55%)	⬆️
pydrad/parse/__init__.py	100.00% <100.00%> (ø)
pydrad/visualize/__init__.py	100.00% <100.00%> (ø)
pydrad/visualize/animate.py	20.00% <100.00%> (ø)
pydrad/configure/data/__init__.py	57.14% <57.14%> (ø)
pydrad/configure/util.py	87.93% <84.09%> (+46.75%)	⬆️
pydrad/configure/configure.py	80.58% <65.38%> (+22.92%)	⬆️
pydrad/parse/parse.py	71.28% <78.46%> (+38.48%)	⬆️
... and 1 more

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.