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/entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Check if the initialization has already been done and that we enabled automatic migration
+if [ "${ENABLE_DB_MIGRATIONS}" = "true" ] && [ ! -f /app/${STORAGE_LOCAL_PATH:-.local-storage}/db_initialized ]; then
+    echo "Running database setup and migrations..."
+
+    # Run setup and migration scripts
+    npx ts-node ./scripts/setup-db.ts
+    yarn database:migrate:prod
+
+    # Mark initialization as done
+    echo "Successfuly migrated DB!"
+    touch /app/${STORAGE_LOCAL_PATH:-.local-storage}/db_initialized
+fi
+
+# Continue with the original Docker command
+exec "$@"