[Automation] Markdown linting

[davidvonthenen]

Proposed changes

Markdown should adhere to known standards. Look into:
ghcr.io/igorshubovych/markdownlint-cli

This is already implemented in Go and needs to be ported over:
deepgram/deepgram-go-sdk#208

Context

Possible Implementation

Other information

[davidvonthenen]

PR Merged: #394