refactor(slides): consolidate config into config/_default/hugo.yaml

modules/slides/config.yaml

@@ -1,6 +0,0 @@
-module:
-  mounts:
-    - source: assets
-      target: assets
-    - source: layouts
-      target: layouts

modules/slides/config/_default/hugo.yaml

@@ -1,3 +1,10 @@
+module:
+  mounts:
+    - source: assets
+      target: assets
+    - source: layouts
+      target: layouts
+
 outputFormats:
   Present:
     mediaType: text/html