Update docs.yml

Author: tomvanmele

.github/workflows/docs.yml

@@ -17,21 +17,18 @@ jobs:
     env:
       GH_PAT: ${{secrets.GH_PAT}}
     steps:
-
       - uses: actions/checkout@v2
-
-      - uses: conda-incubator/setup-miniconda@v2.0.0
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
         with:
-          miniconda-version: "latest"
-          activate-environment: compas-dev
-          channels: conda-forge
           python-version: 3.8
-
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install cython --install-option="--no-cython-compile"
       - name: Install
         run: |
-          conda install cython graphviz
-          python -m pip install -r requirements-dev.txt
-
+          python -m pip install --no-cache-dir -r requirements-dev.txt
       - name: Generate docs
         if: ${{ success() }}
         run: |