chore(docs): use gh action to build docs (#8097)

# Which Problems Are Solved

This allows us to build multiple docs in parallel and only runs when
docs/proto are changed.

# Additional Changes

- [ ] Change "required" in GitHub from Vercel to the docs flow

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

docs/Dockerfile

@@ -1,13 +0,0 @@
-## Angular lint workspace and production build
-FROM node:18 as builder
-WORKDIR /docs
-COPY docs/package.json docs/yarn.lock ./
-RUN yarn install --frozen-lockfile
-COPY docs .
-COPY proto /proto
-RUN yarn build
-
-## Final image for serving
-FROM nginx as final
-COPY docs/nginx.conf /etc/nginx/nginx.conf 
-COPY --from=builder /docs/build /usr/share/nginx/html