Use code snippet to embed viewer in your website

[meganrm]

• [x] https://github.com/simularium/simularium-planning/issues/145
• [x] https://github.com/simularium/simularium-planning/issues/146
• [x] #188

Use Case

User wants to embed the viewer showing their trajectory on their website.

Acceptance Criteria

A user gets a chunk of code that they can paste into their own website, that points to just their trajectory (not the full site ideally)

Details

Add a "embed" option that creates iframe code