IssueID #1487: simplified setup

scripts/setup.sh

@@ -5,8 +5,9 @@ cd ..
 ## set up virtual environment
 python3 -m venv venv
 source venv/bin/activate
-pip install wheel
-pip install -r requirements.txt
+pip install classla
+pip install lxml
+pip install obeliks
 python -c "import classla; classla.download('sl_ssj_jos')" <<< $'Y\nresources/classla'
 deactivate