Changed action to auto build from develop not main

Author: DsposalTom

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: ci
 on:
   push:
     branches:
-      - main
+      - develop
 permissions:
   contents: write
 jobs:
@@ -13,5 +13,6 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x
-      - run: pip install mkdocs-material 
+      - run: pip install mkdocs-material
+      - run: pip install mermaid
       - run: mkdocs gh-deploy --force