m03 test adequacy

[iamabhutta]

Starting with Sum26 slides
TODO:
-Update as needed
-Review activities and update as needed

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[mwand]

Now just a single slide deck and a single activity. Rewrote Learning Objective to match new slide deck. I still haven't gotten l3.md and modules.yml to work together. Can you fix this?

[iamabhutta]

fixed. It was missing a dash.

[iamabhutta]

what's the need for this? I thought link was working fine.

[mwand]

Still need to check that activity runs as advertised. Maybe have TA check. Otherwise LGTM.

Note that we no longer use Postman. I'm guessing that most of our uses of Postman can be replaced by supertest. (Have I mentioned lately that I hate Postman?). There are several good tutorial intros for Supertest; no need to write our own tutorial (yay!).

[iamabhutta]

Manas checked the code for activity and confirmed that it works.
We also removed the postman.
Ready to merge, when we need (probably Friday 9/12)