Remove sphinx_rtd_theme from CI (#510)

Author: manoelmarques

.github/workflows/deploy-docs.yml

@@ -36,7 +36,7 @@ jobs:
       - uses: ./.github/actions/install-machine-learning
       - name: Install Dependencies
         run: |
-          pip install jupyter sphinx_rtd_theme qiskit-terra[visualization] 'torchvision<0.10.0'
+          pip install jupyter qiskit-terra[visualization] 'torchvision<0.10.0'
           sudo apt-get install -y pandoc graphviz
         shell: bash
       - name: Build and publish
@@ -68,7 +68,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install jupyter sphinx_rtd_theme qiskit-terra[visualization] 'torchvision<0.10.0' tox
+        pip install jupyter qiskit-terra[visualization] 'torchvision<0.10.0' tox
         sudo apt-get install -y graphviz pandoc
     - name: Build and publish
       env:

.github/workflows/main.yml

@@ -63,7 +63,7 @@ jobs:
       - uses: ./.github/actions/install-machine-learning
       - name: Install Dependencies
         run: |
-          pip install jupyter sphinx_rtd_theme qiskit-terra[visualization] 'torchvision<0.10.0'
+          pip install jupyter qiskit-terra[visualization] 'torchvision<0.10.0'
           sudo apt-get -y install pandoc graphviz
           sudo apt-get -y install python3-enchant
           sudo apt-get -y install hunspell-en-us
@@ -206,7 +206,7 @@ jobs:
       - uses: ./.github/actions/install-machine-learning
       - name: Install Dependencies
         run: |
-          pip install jupyter sphinx_rtd_theme qiskit-terra[visualization] 'torchvision<0.10.0'
+          pip install jupyter qiskit-terra[visualization] 'torchvision<0.10.0'
           sudo apt-get install -y pandoc graphviz
         shell: bash
       - name: Run Machine Learning Tutorials