WIP: Modifications conducive to Kubernetes deployment

[manning-ncsa]

This merge request includes a variety of changes implemented for a Kubernetes deployment driven by this associated Helm chart. Changes and fixes include:

• CSS and JS loading
• parameterizing hard-coded environment variables and Django settings
• refactoring initialization scripts to reduce runtime by minimizing the repetition of slow python imports
• creating an empty checkfile upon successful initialization so that subsequent restarts skip the init scripts
• parameterize Celery time limits
• add full initialization script for required data
• fix issues with initialization of .dustmapsrc
• convert all references to 2010h to 2010H

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.62%. Comparing base (83a2965) to head (be2abed).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   53.59%   53.62%   +0.02%     
==========================================
  Files          28       28              
  Lines        3353     3355       +2     
==========================================
+ Hits         1797     1799       +2     
  Misses       1556     1556              

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