To be framework agnostic you gotta build Chatness elements bundle from your own end.
Make sure to have followed all the setup stage and included the Firebase SDK
This command will build the content from
src/app/components as well as needed styles as custom elements (web components) into a single js bundle called
Afterwards all you gotta do is to include this bundle in your framework of choice.
You can execute
npx serve dist/elements to see the generated result.
dist/elements/index.html for further details.