build: documentation generation fixed again

.github/workflows/conan-ci.yml

@@ -67,20 +67,26 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: '3.8'
-      - name: Install dependencies
+      - name: Install Python dependencies
         run: |
           pip install -Ur docs/requirements.txt
       - name: Install Conan
         run: |
           pip install -U conan
+      - name: Configure Conan
+        run: |
           conan config init
-      - name: Generate
+          conan remote add upload ${{ secrets.CONAN_UPLOAD }}
+          conan remote add linear-algebra https://api.bintray.com/conan/twonington/public-conan
+      - name: Install Conan dependencies
         run: |
           mkdir build && cd build
-          conan install .. -e CONAN_RUN_TESTS=True
+          conan install .. -s compiler.cppstd=20 -e mp-units:CONAN_RUN_TESTS=True
+      - name: Generate documentation
+        run: |
           cmake ..
           cmake --build . --target sphinx
-      - name: Deploy
+      - name: Deploy documentation
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}