Markdown linting

[mlangbehn]

Our current Markdown linter (textlint), may not be actually checking Markdown syntax.

As such, we need to:

1. Verify textlint is checking Markdown syntax
2. If it isn't, investigate other options
   • markdownlint -More specifically, markdownlint-cli
   • mdl
   • mdlint
   • Other options?

If we need to look at a new option, it must:

• [x] Lint GitHub Flavored Markdown syntax
• [x] Be configurable
  • [x] Enable/disable specific rules

[mlangbehn]

Working on this in https://github.com/mlangbehn/lore/tree/add_markdownlint-cli

[eggshell]

I've used markdownlint with some success in the past, so I vote we move to that and bring the repo up to snuff. I'm fine with keeping the textlint stuff present since others find value in its feedback.

[mlangbehn]

Agreed. I'll knock that out tomorrow.