misc: Remove mentions to unneeded Poetry mention

Poetry 1.8.0 already includes support for `package-mode = false`, so
there's no need to install a Poetry fork anymore.

DEVELOPER_SETUP.md

@@ -34,20 +34,16 @@ You'll need poetry installed
 
 https://python-poetry.org/docs/#installing-with-the-official-installer
 
-**_WARNING:_** Until poetry 1.8.0 version is released, poetry needs to be installed with the new non-package-mode feature branch:
-
 ```sh
-pipx install --suffix _npm git+https://github.com/radoering/poetry.git@non-package-mode
+pipx install poetry
 ```
 
-More info: https://github.com/python-poetry/poetry/pull/8650
-
 Then create the virtual environment
 
 ```sh
-# Fix disable parallel installation stuck: $> poetry_npm config experimental.new-installer false
+# Fix disable parallel installation stuck: $> poetry config experimental.new-installer false
 # Fix Loading macOS/linux stuck: $> export PYTHON_KEYRING_BACKEND=keyring.backends.null.Keyring
-poetry_npm install --sync
+poetry install --sync
 ```
 
 ### - Spin up mariadb in docker
@@ -62,14 +58,14 @@ docker-compose up -d
 
 ```sh
 cd backend
-poetry_npm run python3 main.py
+poetry run python3 main.py
 ```
 
 ### - Start a worker
 
 ```sh
 cd backend
-poetry_npm run python3 worker.py
+poetry run python3 worker.py
 ```
 
 ## Setting up the frontend
@@ -130,5 +126,5 @@ docker exec -i mariadb mariadb -u root -p<root password> < backend/romm_test/set
 ```sh
 cd backend
 # path or test file can be passed as argument to test only a subset
-poetry_npm run pytest [path/file]
+poetry run pytest [path/file]
 ```

backend/utils/generate_supported_platforms.py

@@ -1,4 +1,4 @@
-# poetry_npm run python3 -m utils.generate_supported_platforms
+# poetry run python3 -m utils.generate_supported_platforms
 from typing import TypedDict
 
 from handler.metadata.igdb_handler import IGDB_PLATFORM_LIST