[WIP] Add local Markdown checks

[chykon]

Description & Motivation

This set of changes adds an easy way to locally check text formatting and link health in Markdown files.

TODO: Add required dependencies to GitHub Codespaces (check https://containers.dev/features).

Related Issue(s)

No.

Testing

Run checks locally and see the output.

Backwards-compatibility

Is this a breaking change that will not be backwards-compatible? If yes, how so?

No.

Documentation

Does the change require any updates to documentation? If so, where? Are they included?

No.