133 update setupcfg

[maho3]

Revises setup.cfg , addressing #133 .

Now,

• pip install -e ltu-ili will automatically detect which python version you're using and install the correct backend. tensorflow for Python<3.7 or torch for Python>=3.7.
• No more pip install -e "ltu-ili[torch]" or pip install -e "ltu-ili[tensorflow]".
• Now, you can specify extras ltu-ili[docs] or ltu-ili[dev] to install supplementary doc-building or test-running packages. These will likely only be handled by developers.
• INSTALL.md has been updated to reflect these changes and also be more concise and shorter, therefore less intimidating for new users.
• Several packages (e.g. camb) have been removed because we don't use them anymore.

[codecov-commenter]

Codecov Report

Attention: 302 lines in your changes are missing coverage. Please review.

Comparison is base (17532c4) 97.27% compared to head (38d13b0) 79.24%.

Files	Patch %	Lines
ili/inference/runner_lampe.py	18.18%	126 Missing :warning:
ili/utils/ndes_pt.py	20.18%	87 Missing :warning:
ili/embedding/message_passing_gnn.py	0.00%	74 Missing :warning:
ili/dataloaders/loaders.py	52.63%	9 Missing :warning:
ili/inference/runner.py	28.57%	5 Missing :warning:
ili/validation/metrics.py	80.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #134 +/- ## =========================================== - Coverage 97.27% 79.24% -18.04% =========================================== Files 22 24 +2 Lines 1249 1619 +370 =========================================== + Hits 1215 1283 +68 - Misses 34 336 +302 ```

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