ci: Add GitHub Workflow

[seanpoulter]

Proposed Changes

Add a GitHub Workflow

• Add .nvmrc to document the minimum version of Node.js
• Configure yarn:
  • Remove the hard-coded yarnPath from .yarnrc.yml so we can contribute to the repo
  • Do not use zero-install yarn
    • Follow the docs to update .gitignore
    • Remove .yarn/install-state.gz from version control
• Configure Mocha
  • Use the bdd style so describe and it are defined
• Fix TypeScript errors
  • Enable "skipLibCheck"
  • Remove unused variables with TypeScript errors :fire:
• Remove unnecessary files
  • Remove the generated test//*.js** files. They're not used.
  • Remove the "nested" test case. It doesn't test anything new.
• Fix spelling

Test Plan

Here's an example of the Workflow results. The tests fail. https://github.com/seanpoulter/wdio-html-reporter/actions/runs/8414054497/job/23037156333