fix: fixing canrager SAEs in SAEs table docs

[chanind]

Description

This PR fixes docs/generate_sae_table.py to support canrager SAEs, which is breaking when building docs. Currently, the code to load the config file for building the SAEs table re-implements the converter loading code, I think because the converters also download the full SAEs which is not necessary for building the table.

This PR also removes docs/sae_table.md from git and adds it to .gitignore since this is auto-generated by CI anyway and the file in the repo is ignored.

Longer-term, we should refactor the converters to allow loading only the config and not the full SAE so we don't have to remember to implement new converters in 2 places.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility

You have tested formatting, typing and unit tests (acceptance tests not currently in use)

• I have run make check-ci to check format and linting. (you can run make format to format code if needed.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.36%. Comparing base (cdc64c1) to head (16ba8e1).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage   62.36%   62.36%           
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  Files          25       25           
  Lines        3135     3135           
  Branches      546      546           
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  Hits         1955     1955           
  Misses       1077     1077           
  Partials      103      103           

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[jbloomAus]

thanks for the fix!