Make an assessments dictionary, @assessment{} directive and track them separately in the Materials Table

[flannery-denny]

| Assessment section with
| [.assessment links]

We want an @assessment{} directive that should refer to a dictionary that is similar to but not part of starter-files.js

Given a key, we want the title to appear with a link to the URL.

• this should happen at the point it appears in the lesson plan
• it should also be autoincluded in a new assessment section of the materials table

ES mocked up assessments.js