⚖️♻️：refactor contents of LICENSE.md into CONTRIBUTING.md

[DerekNonGeneric]

Pull Request Purpose

Make a selection on the purpose(s) of your changes.

This PR contains the following:

• 🐞🔧 bugfixing (🐜/🦟/🐛/🦗/🐝 et al.)
• 🆕🎏 implementation of new feature(s)
• ♻️ refactoring(s)
• 📄 documentation modification(s)
• 🔮 other

Testing

Have you included any tests in your submission?

• yes (bugfixes and features will not be merged without
  tests)
• no

Breaking Changes

Have you modified any aspect public API surface (i.e., caused breakage)?

• yes (breaking changes will not be merged unless
  necessary)
• no

Description

A concise recap summarily detailing what all are the changes being made.

Additional guidance on

• license file sourcing and location in repo
• license selection process (choices we support, alterations)
• DIY: bowdlerize entire MIT license header like a wannabe-🦀

Refs: #642 (comment)

List of any relevant issue numbers:

• ⚖️ get real about license guidance in contribution guidelines #642
• Add open source software license mozilla-spidermonkey/cacheirhealthreport#39

[DerekNonGeneric]

NEW CONTENT REQUESTED

• 📖🔔 Licensing a Repository (Rebranded w/o Pitfalls)

ABORT ENDEAVOR GRACEFULLY

[DerekNonGeneric]

The public is clamoring for us "get real" because the topic of Licensing a Repository could not be adequately addressed within a CONTRIBUTING file w/o completely taking over the majority of the document's real estate due to the sheer quantity of content necessary to adequately address the various topics involved and be successful in pursuit of the endeavor.

— #652 (comment)

Topic: Project license guidelines — excessively verbose — closing!

[DerekNonGeneric]

We disagree w/ the platform on following:

• https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository#determining-the-location-of-your-license
• https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository#detecting-a-license

This will be elaborated on in the new document…