Revert "Add heroku setup and action (#8)"

This reverts commit 5138b4c.

Author: LauraBoenchenLB

.github/workflows/model-training.yml

@@ -6,16 +6,13 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v3
-
       - name: Setup Python und install requirements
         uses: actions/setup-python@v4
         with:
           python-version: "3.8"
       - run: pip install -r requirements.txt
-
       - name: Train model
         run: python src/train.py
-
       - name: Upload trained model
         uses: actions/upload-artifact@v4
         with: