Integrate MegaLinter Github Action into Workflow

[kehoecj]

Mega linter has a Github Action that can easily be added to the existing workflow. This will help with code reviews by adding markdown validation, spell check, and other useful linting checks. You'll need to disable config validation as we intentionally have malformed config files for testing.

[Kashugoyal]

Hi, I would like to take this issue. I have a PR in progress already: #218

My solution:

1. Add the megalinter githab action, include the security steps.
2. Lint the code as necessary to ensure pipeline success.

If the number of commits in my PR are excessive, I will squash them together.

[Kashugoyal]

Ready for review: #218