fix(demo): BaseURL

Some paths in the demo were wrong due to missing BaseURL.

netlify.toml

@@ -1,5 +1,5 @@
 [build]
-  command = "hugo --themesDir ../../"
+  command = "hugo --gc --minify -b $DEPLOY_PRIME_URL --themesDir ../../"
   base    = "exampleSite"
   publish = "exampleSite/public"