[DOCS] Add base directory (#1353)

.github/workflows/manual_docs_to_dev.yml

@@ -24,6 +24,7 @@ jobs:
         run: |
           sed -i "s/version_tag/${{ steps.short-sha.outputs.sha }}/g" main/User_config.h
           sed -i "s/version_tag/${{ steps.short-sha.outputs.sha }}/g" docs/.vuepress/config.js
+          sed -i "s|base: '/'|base: '/dev/'|g" docs/.vuepress/config.js
       - name: Run PlatformIO
         run: platformio run
       - name: Prepare Release Assets