Changed the badge to Unitary Foundation[issue #2644]

[muddi900]

Description

Change the badge to reflect the rebranding of the org. Fixes #2644

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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

[github-actions]

Hello @muddi900, thank you for submitting a PR to Mitiq! We will respond as soon as possible, and if you have any questions in the meantime, you can ask us on the Unitary Fund Discord.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.73%. Comparing base (93e6ec3) to head (2b7a0a4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2645   +/-   ##
=======================================
  Coverage   98.73%   98.73%           
=======================================
  Files          92       92           
  Lines        4198     4198           
=======================================
  Hits         4145     4145           
  Misses         53       53           

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