set internal plugin link

_config.yml

@@ -3,7 +3,8 @@ title: InvenTree
 tagline: Intuitive Inventory Management
 demo-link: https://inventree.readthedocs.io/en/latest/demo/
 doc-link: https://inventree.readthedocs.io/en/latest/
-plugin-link: https://repo.invenhost.com/
+plugin-link: 
+  internal: plugins.html
 
 description: >-
   InvenTree is an open-source inventory management system which provides intuitive parts management and stock control.

_data/general/footer.yml

@@ -5,7 +5,7 @@
   - name: Demo
     site: demo-link
   - name: Plugins
-    site: plugin-link
+    internal: plugins.html
 
 - title: Contribute
   cats:
@@ -27,7 +27,7 @@
   - name: API
     link: https://inventree.readthedocs.io/en/latest/extend/python/
   - name: Plugins
-    site: plugin-link
+    internal: plugins.html
   - name: KiCad
     link: https://github.com/sparkmicro/Ki-nTree/
   - name: Fusion360