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/.env.example

@@ -0,0 +1,23 @@
+TAG=latest
+
+# POSTGRES_ADMIN_PASSWORD=replace_me_with_a_strong_password
+
+PG_DATABASE_HOST=db:5432
+
+SERVER_URL=http://localhost:3000
+# Uncoment if you are serving your front on another server than the API (eg. bucket)
+# FRONT_BASE_URL=http://localhost:3000
+
+# Use openssl rand -base64 32 for each secret
+# ACCESS_TOKEN_SECRET=replace_me_with_a_random_string_access
+# LOGIN_TOKEN_SECRET=replace_me_with_a_random_string_login
+# REFRESH_TOKEN_SECRET=replace_me_with_a_random_string_refresh
+# FILE_TOKEN_SECRET=replace_me_with_a_random_string_refresh
+
+SIGN_IN_PREFILLED=true
+
+STORAGE_TYPE=local
+
+# STORAGE_S3_REGION=eu-west3
+# STORAGE_S3_NAME=my-bucket
+# STORAGE_S3_ENDPOINT=