feat: Remove podTemplateFolder as a variable.

This is now possible due to TemplatedResourcesGenerator
accepting path strings relative to the module root.

test/integration/config/server-without-auth.json

@@ -48,6 +48,10 @@
       "PassthroughStore:_source": {
         "@id": "urn:solid-server:default:MemoryResourceStore"
       }
+    },
+    {
+      "@id": "urn:solid-server:default:ResourcesGenerator",
+      "TemplatedResourcesGenerator:_templateFolder": "$PACKAGE_ROOT/test/assets/templates"
     }
   ]
 }