Move to readthedocs, now using pre-commit code cleaning

[ConnorStoneAstro]

Moving to readthedocs provides some benefits such as seeing a build of the documentation before merging a PR into the main branch.

Pre-commit does automated code cleaning to ensure that everything is formatted consistently.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.72034% with 91 lines in your changes are missing coverage. Please review.

Project coverage is 79.14%. Comparing base (38ba7f0) to head (4d4b11c). Report is 1 commits behind head on dev.

Files	Patch %	Lines
astrophot/plots/diagnostic.py	20.00%	12 Missing :warning:
astrophot/utils/isophote/integrate.py	0.00%	8 Missing :warning:
astrophot/fit/oldlm.py	12.50%	7 Missing :warning:
astrophot/utils/isophote/extract.py	53.84%	6 Missing :warning:
astrophot/models/point_source.py	58.33%	5 Missing :warning:
astrophot/fit/lm.py	87.87%	4 Missing :warning:
astrophot/models/core_model.py	69.23%	4 Missing :warning:
astrophot/utils/initialize/segmentation_map.py	55.55%	4 Missing :warning:
astrophot/models/_shared_methods.py	75.00%	3 Missing :warning:
astrophot/plots/profile.py	0.00%	3 Missing :warning:
... and 23 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #169 +/- ## ========================================== - Coverage 79.43% 79.14% -0.30% ========================================== Files 90 91 +1 Lines 7669 7557 -112 ========================================== - Hits 6092 5981 -111 + Misses 1577 1576 -1 ```

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