split stable/develop docs workflow CI

.github/workflows/docs_develop.yml

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+name: docs
+
+on:
+  push:
+    branches: [ develop ]
+  pull_request:
+    branches: [ develop ]
+
+jobs:
+  develop:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.9
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        # Fix version for now, 3.4 throws an error (see #101)
+        pip install markdown==3.3.7
+        pip install ford==6.1.13 graphviz
+        sudo apt-get install graphviz
+        pip install -U sphinx
+        pip install numpydoc sphinx-rtd-theme lazy-object-proxy==1.4 sphinx-autoapi
+
+    - name: Generate documentation
+      run: |
+        cd docs
+        python generate_docs.py develop
+
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v3
+      # only deploy if the branch is develop
+      if: ${{ contains(github.ref, 'refs/heads/develop') }}
+      with:
+          deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+          external_repository: n-claes/legolas.science-dev
+          publish_branch: main
+          publish_dir: ./docs
+          cname: dev.legolas.science
+          enable_jekyll: true
+          full_commit_message: 'dev: deploy n-claes/legolas@${{ github.sha }}'

.github/workflows/docs_stable.yml

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+name: docs
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  stable:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.9
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        # Fix version for now, 3.4 throws an error (see #101)
+        pip install markdown==3.3.7
+        pip install ford==6.1.13 graphviz
+        sudo apt-get install graphviz
+        pip install -U sphinx
+        pip install numpydoc sphinx-rtd-theme lazy-object-proxy==1.4 sphinx-autoapi
+
+    - name: Generate documentation
+      run: |
+        cd docs
+        python generate_docs.py stable
+
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v3
+      # only deploy if the branch is master
+      if: ${{ contains(github.ref, 'refs/heads/master') }}
+      with:
+          deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY_STABLE }}
+          external_repository: n-claes/legolas.science-stable
+          publish_branch: main
+          publish_dir: ./docs
+          cname: legolas.science
+          enable_jekyll: true
+          full_commit_message: 'stable: deploy n-claes/legolas@${{ github.sha }}'