Revert "delete installation of mermaid-filter (#200)"

This reverts commit 841343a.

Author: ma91n

.github/workflows/GHPages.yml

@@ -15,7 +15,8 @@ jobs:
           args: sh build-resources-with-pandoc.sh
       - name: Install Packages
         run: |
-          npm i -fz
+          npm i -f
+          npm i --global mermaid-filter
       - name: Build all
         run: |
           npm run build