Remove duplicate readme entery in toctree

[jordandsullivan]

Description

This fixes the issue in my local build. This also fixes the "2nd readme" issue in #2331 (comment)

The "next" button goes to the user guide rather than a duplicate of the Readme:

-->

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License

• I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• I added unit tests for new code.
• I used type hints in function signatures.
• I used Google-style docstrings for functions.
• I updated the documentation where relevant.
• Added myself / the copyright holder to the AUTHORS file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.22%. Comparing base (6ff6c08) to head (2ee9d09).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2362   +/-   ##
=======================================
  Coverage   98.22%   98.22%           
=======================================
  Files          87       87           
  Lines        4059     4059           
=======================================
  Hits         3987     3987           
  Misses         72       72           

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[purva-thakre]

Thanks Jordan!