* Use Prettier to format HTML, CSS, and Markdown files
Currently alalama uses Sublime's built-in formatter while JonathanDCohen uses VS Code. This standardizes us on Prettier and adds formatting to our pre-commit hooks.
pretty-quick has no option to only format changed lines, so this commit will be followed by a format of the src/ directory in order to keep unrelated formatting changes from polluting diffs in upcoming commits.
Code contributors can use the instructions at https://prettier.io/docs/en/editors.html if they'd like to integrate prettier with their editor of choice
* Format html and css files in ui_components
* Fix some html errors found by Prettier
This corresponds with the same change in outline-client
Tested:
yarn do {server_manager/test, shadowbox/test, shadowbox/integration_test/run, sentry_webhook/build, metrics_server/build}
