Remove moxygen install from workflow.

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
     - uses: actions/checkout@v3
       with:
         fetch-depth: 1
-        
+
     - uses: actions/setup-node@v3
       with:
         node-version: 16
@@ -35,7 +35,6 @@ jobs:
     - name: Install dependencies
       run: |
         apt-get update && apt-get install -y rsync nodejs npm doxygen
-        npm install -g moxygen
 
     - name: Build doxygen docs
       run: |