Implement recommendations in RRA

[simonwex]

Follow-on for #669

Based on the recommendations here (locked) https://bugzilla.mozilla.org/show_bug.cgi?id=1239499

Do the following work:

• Record when content is modified mozilla/api.webmaker.org#195
• Feature to force password reset mozilla/id.webmaker.org#410
• Record when content is modified mozilla/publish.webmaker.org#219
• api: https://bugzilla.mozilla.org/show_bug.cgi?id=1243167
• id: https://bugzilla.mozilla.org/show_bug.cgi?id=1243170
• publish: https://bugzilla.mozilla.org/show_bug.cgi?id=1243172

Driver: @simonwex
Dev: @cadecairos, @jbuck
Consulted: @KevZawacki

[simonwex]

Related to #728

[hannahkane]

Possible to put a size label on this ticket? Small, medium, or large? (Will help with planning future heartbeats.)

[simonwex]

We didn't have time this HB, I'm rolling forward two.

[hannahkane]

Moving to June 3rd milestone, since it corresponds to our heartbeat schedule.

[hannahkane]

@simonwex - should this go in the first post-London milestone?

[hannahkane]

Moving this, so I can close the June 3 milestone.

[simonwex]

I'd say so. FYI - @cadecairos

[hannahkane]

Moving this out of July 1 heartbeat.