A few changes to the record embeds

[pfrazee]

Hey @devinivy now that I'm finally futzing with the record embeds, I'm hitting a couple things I could use changes on. We could group this into the lexicon refactor.

• We need the indexedAt field somewhere in there I think. Right now we're using createdAt which can be effed with.
• I was wrong. We do need the presented form to have the presented embeds of the embedded record. Specifically for images. My bad.
• Right now the presented form ends up with record.record. Not a huge deal but if inspiration hits, it'd be great to have another name for the outer bit.

[pfrazee]

We also need to check on:

• Notifications created for quote posts
• Quote post count metrics

[dholms]

fixed #658