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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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