feat(workflows): updated github actions workflows

[ovflowd]

Description

This PR updates the workflows by giving common names, grouping correlated jobs, and fixing the GitHub Pages workflow to add a PATH-PREFIX, it also ensures all are using Node.js v16.

Related Issues

Relates to https://github.com/nodejs/nodejs.dev/issues/2749

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npm run lint:js -- --fix and/or npm run lint:md -- --fix for my JavaScript and/or Markdown changes.
  • This is important as most of the cases your code changes might not be correctly linted
• I have run npm run test to check if all tests are passing, and/or npm run test -- -u to update snapshots if I created and/or updated React Components.
• I have checked that the build works locally and that npm run build work fine.
• I've covered new added functionality with unit tests if necessary.

[ovflowd]

cc @nschonni @MylesBorins

[benhalverson]

why are you deleting the test.yml workflow?

[ovflowd]

why are you deleting the test.yml workflow?

It became just one workflow with two jobs. We don't need so many workflow files 🙈

[github-actions]

Please find a preview at: https://staging.nodejs.dev/2750/