Problem: We have TypeScript enabled on the project but have been missing
lots of definition files, so there are like 500 errors when you enable
`--noImplicitAny`.
Solution: Add definitions and fix the bugs that they point out. This
reduces the number of errors with `--noImplicitAny` to 285.
Problem: Our dependencies are falling behind and it'd be nice to have
them up-to-date. The only big update it that Common-Good upgraded to the
latest version of Prettier.
Solution: Update them!
Problem: Emoji from Markdown posts were being displayed in the default
font, which doesn't always use color emoji.
Solution: Use the `.emoji` CSS class on those emoji to ensure that the
correct emoji font is used.
Problem: The model code was doing our Markdown rendering, which feels to
me like a layer violation because *generally* the model is meant to be a
thin abstraction over the underlying database without any concept of the
presentation layer.
Solution: Move the Markdown renderer to the view module and manage
Markdown rendering in the presentation layer.
