This PR aims to resolve common misunderstanding while deploying Twenty
with Docker compose.
I've made the documentation clearer, and more detailed.
This should solve https://github.com/twentyhq/twenty/issues/5184, #6140
and similar issues
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.
