Added dump from GE helper docs

[getorymckeag]

I sanitized some help documentation that I thought would be helpful for TROLIE. Adds some markdown pages to the Jekyll site, including:

• Overall discussion on the usage of REST. This is not meant to be an ADR- rather, it's a narrative for people learning about TROLIE as to what it's not ICCP, or CSV files or something else they would come in biased towards.
• Some concept definitions. Should obviously be expanded upon
• Walkthrough examples with Curl. FWIW, I tried to see if we can reuse JSON examples from the spec in these pages using Liquid templates. The closest I came was to do that and run it through the jsonify function, but there isn't a way to pretty-print it.
• Some explicit discussion of why RFC 3339 helps make DST less of a nightmare.

[caindy]

This is great! I opened a draft PR against this branch to highlight three ways to reuse JSON examples without losing formatting. #30

That PR is meant to make it easy to review; I don't want to merge it. Instead, once we pick a way, we'll just update this branch.

I'd also like an opportunity to proofread this and offer some suggested edits.