fix(docs): Update docs with nord-aurora theme

[DenverCoder1]

Description

This pull request adds a new theme, nord-aurora, to the list of available themes in the documentation. The change includes an example image for the new theme.

#838

• Documentation update:
  • Added nord-aurora to the themes table in docs/themes.md, including a preview image.

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• 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

Screenshots