28dceada87
Took a first pass at adding some docs on how we use Lit at Mozilla. I tried to highlight the ways in which using Lit in mozilla-central might differ from what's in the (already pretty comprehensive) Lit project docs. If anything I probably wrote too much, but let me know if you think I missed anything or if there's anything I can cut. Differential Revision: https://phabricator.services.mozilla.com/D180457