Add github action for automatic code linting

[AndrewJamison]

Is your feature request related to a problem? Please describe.
There's currently no automatic linting happening.

Describe the solution you'd like
We would like to automate linting using github actions

Describe alternatives you've considered
N/A

Additional context
N/A

[kayleekimberly]

@upkarlidder @demilolu This issue needs the ms-cohort-claimed label

[nic-jol]

Super-Linter
Source: https://github.com/marketplace/actions/super-linter
Provides the following linters for the languages used in this project:

• HTML: HTMLHint
• JavaScript: ESLint and standard js
• CSS: stylelint

[nic-jol]

JS Specific Linters

1. JSLint

• https://github.com/jslint-org/jslint
• Could not install properly but can use online by pasting file contents: https://www.jslint.com/

2. JSHint

• https://jshint.com/install/
• Use online by pasting file contents: https://jshint.com/
• Install locally: sudo npm install -g jshint
• Run locally; jshint <file or directory name>
• Example output:
  

3. ESLint

• Used by Super-Linter
• https://eslint.org/docs/user-guide/getting-started
• Install locally: sudo npm install eslint -g

[github-actions]

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