Remove false URL in README

[lewtun]

Reference issues/PRs

Types of changes

• [ ] 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 change)

Description

Removes a URL from the README that no longer points to specific giotto-tda applications

Screenshots (if appropriate)

Any other comments?

Checklist

• [ ] I have read the guidelines for contributing.
• [ ] My code follows the code style of this project. I used flake8 to check my Python changes.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed. I used pytest to check this on Python tests.