Simplify docs and remove Docker local setup (#4783)

Having 2 different dev setups caused confusion, let's remove the Docker
local setup and recommend people install yarn locally.

Also simplified some docs by merging pages together, the recommend
self-hosting option is now the docker-compose / to adapt the
docker-compose.

packages/twenty-docker/twenty-docs/Dockerfile

@@ -0,0 +1,31 @@
+FROM node:18.17.1-alpine as twenty-docs-build
+
+WORKDIR /app
+
+ARG SHOULD_INDEX_DOC
+
+COPY ./package.json .
+COPY ./yarn.lock .
+COPY ./.yarnrc.yml .
+COPY ./.yarn/releases /app/.yarn/releases
+COPY ./packages/twenty-docs/package.json /app/packages/twenty-docs/package.json
+COPY ./packages/twenty-emails /app/packages/twenty-emails
+RUN yarn
+
+COPY ./packages/twenty-docs /app/packages/twenty-docs
+RUN yarn nx build twenty-docs
+
+CMD ["tail", "-f", "/dev/null"]
+
+FROM node:18.17.1-alpine as twenty-docs
+
+WORKDIR /app/packages/twenty-docs
+
+COPY --from=twenty-docs-build /app/packages/twenty-docs/build ./build
+
+RUN yarn global add serve
+
+LABEL org.opencontainers.image.source=https://github.com/twentyhq/twenty
+LABEL org.opencontainers.image.description="This image provides a consistent and reproducible environment for the documentation."
+
+CMD ["serve", "-s", "./build"]