Lighthouse CI Github Action to run on HTML repos

[SallyMcGrath]

Which module(s) and week(s) does this change affect? Module(s): HTML-CSS Week(s): 1-4 + Project

What is the work that needs to be done?

As part of TDD conversion, we want Lighthouse to run and pass on all PRs to HTML-CSS modules if possible

Why is this work important to do?

• support Accessibility teaching
• support testing and code quality teaching
• support TDD conversion, stage 1, running tests and 2

Additional context

• https://docs.google.com/document/d/1b-UPv-iXMLA6-dQWCeKWHti7qdCDNPYJfhD9ESIbU6c/edit# - Repos:
• Week 1. Coursework | Coursework Solution Week 2. Coursework | Coursework Solution Week 3. Coursework | Coursework Solution Module Project. Project | Project Solution Challenges. Challenges | Solution Lighthouse
• https://github.com/GoogleChrome/lighthouse
• https://github.com/GoogleChrome/lighthouse-ci
• https://github.com/marketplace/actions/lighthouse-ci-action
• https://web.dev/lighthouse-ci/ Who might need to know about this change?

[SallyMcGrath]

linked to #493

[SallyMcGrath]

linked to https://github.com/CodeYourFuture/Changes/issues/4