remove old docs

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.40659% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 79.61%. Comparing base (5d9484a) to head (0298852).

Files	Patch %	Lines
astrophot/plots/image.py	50.00%	2 Missing :warning:
astrophot/utils/operations.py	85.71%	2 Missing :warning:
astrophot/fit/lm.py	93.75%	1 Missing :warning:
astrophot/models/_shared_methods.py	97.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #172 +/- ## ========================================== + Coverage 79.52% 79.61% +0.08% ========================================== Files 91 91 Lines 7616 7649 +33 ========================================== + Hits 6057 6090 +33 Misses 1559 1559 ```

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