Docs: preserve CNAME via --custom-domain and set site_url to https://…

[prefrontalsys]

…mnemex.dev

Description

Type of Change

• 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)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Related Issues

Fixes #

Changes Made

Testing

• All existing tests pass (pytest)
• Added new tests for new functionality
• Tested on multiple platforms (if applicable)
• Manual testing completed

Test Platform(s)

• macOS
• Linux (Ubuntu/Debian)
• Windows

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• 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
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Context

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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