Document! the reorganization how ottr package runs given the iframe

[cansavvy]

Right now, we do a lot of conversions with leanbuild. But with the iframe solution recently implemented by the folks at Leanpub, we can link to each chapter like we do with Coursera. This eliminates a lot of conversion steps 👍

This does mean we need to reevaluate and reorganize the interactions and GHA between OTTR_Template and OTTR_Quizzes.

I think it probably makes sense to render both coursera and leanpub files in the OTTR_Template repository and then transfer them to the Quizzes repository. Then all a user needs to do is write quizzes in the _Quizzes repository (which makes sense).

[cansavvy]

Here's an example of the preview of how iframe works:

https://leanpub.com/courses/jhu/jhudsl_course_template/read/preview/1

What we need to do is figure out what image to put on the poster space.

[cansavvy]

This is on hold until we hear back from the Leanpub people about how the iframe is going.

[cansavvy]

So what we have in Leanbuild is what we have. So solution number 2) will be going forward which is autogenerate a related image to put in place upon rendering.

This lists a couple options of how to do this programmatically. I will test some of these out and determine which makes sense and add it to the Docker image.
https://www.booleanworld.com/take-screenshots-webpages-command-line/

[cansavvy]

The screenshots part is complete. Next for it to make rmarkdowns with those screenshots

[cansavvy]

This is working pretty well now!

[cansavvy]

All that's left is more documenting

[cansavvy]

Done!