grid directive

[Mpdreamz]

Grid

Kind	Link
Reference
Documentation	https://mystmd.org/guide/dropdowns-cards-and-tabs

Implementation

• Parses directives and aliases
• Emits HTML
• Unit tests
• Validation (emits, warnings and errors).

Specification compliance:

• Arguments - column count for responsive barriers (4 integers)

[bmorelli25]

Do we want these to build landing pages with? (with #25)