Description

We discussed removing support for the deprecated Quartus (Intel HLS) backend. In particular, the table lookup implemented in that backend interferes to an extent with the softmax updates. This PR was created with the help of AI to do that

Type of change

• Documentation update
• Other (Specify) -- remove old feature to ease maintenance

Tests

Quartus backend tests should be removed. Other things should pass.

Checklist

• I have read the guidelines for contributing.
• 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 installed and run pre-commit on the files I edited or added.
• I have added tests that prove my fix is effective or that my feature works.