Fix Public API IA (#3996)

Author: markzegarelli

src/_data/sidenav/main.yml

@@ -497,8 +497,13 @@ sections:
     title: Support Access
 - section_title: API
   section:
-  - path: /api/public-api
-    title: Public API
+  - section_title: Public API
+    slug: api/public-api
+    section:
+      - path: /api/public-api
+        title: Public API
+      - path: /api/public-api/fql
+        title: Destination Filter Query Language
   - section_title: Config API
     slug: api/config-api
     section:

src/api/config-api/fql.md renamed to src/api/public-api/fql.md

@@ -1,7 +1,8 @@
 ---
 title: Destination Filter Query Language
 redirect_from:
-  - '/docs/config-api/fql'
+  - '/config-api/fql'
+  - /api/config-api/fql
 ---
 
 {% include content/papi-ga.html %}