Develop CI/CD tests

[TristanDamron]

As a contributor to the Code & Coffee Compendium site, I want a series of CI/CD tests to ensure that my update works as intended after submitting a PR to the main branch.

Github Actions will be developed to test the following:

• Check for broken images.
• Check for broken links.
• Check for missing HTTPS protocol.
• Check for missing alt-text.
• Spell / Grammar check
• Deploy preview site on netlify deploy previewable page on pull requests #95

The following GH Action will only run at deploy time:

• Check to ensure the redirect from https://learnteachcode.org/code-coffee-compendium/ to https://learnteachcode.org/code-coffee-compendium/home/ works correctly.

These tests will ensure a higher quality product, and air PR reviewers by automating some of the more tedious certification tasks.