Added new folders, moved pages, updated order

Author: dcpena

src/content/docs/fundamentals/api/index.mdx

@@ -2,7 +2,7 @@
 title: Cloudflare's API
 pcx_content_type: overview
 sidebar:
-  order: 6
+  order: 7
   group:
     hideIndex: true
 

src/content/docs/fundamentals/changelog.mdx

@@ -4,7 +4,7 @@ title: Changelog
 changelog_file_name:
   - fundamentals
 sidebar:
-  order: 8
+  order: 9
 ---
 
 import { ProductChangelog } from "~/components";

src/content/docs/fundamentals/basic-tasks/improve-seo.mdx renamed to src/content/docs/fundamentals/performance/improve-seo.mdx

@@ -0,0 +1,13 @@
+---
+pcx_content_type: navigation
+title: Performance
+sidebar:
+  order: 6
+  group:
+    hideIndex: true
+
+---
+
+import { DirectoryListing } from "~/components"
+
+<DirectoryListing />

src/content/docs/fundamentals/performance/index.mdx

@@ -2,7 +2,7 @@
 pcx_content_type: navigation
 title: Reference
 sidebar:
-  order: 7
+  order: 8
   group:
     hideIndex: true
 head: