Re-order menu entries

Order them roughly in the order that you'd use them being a novice, I think.

Author: Christopher Carpenter

_data/nav.yml

@@ -16,6 +16,20 @@
     - subtitle: "ABCs"
       subhref: "/abcs.html"
 
+- title: "Implementations"
+  href: "/implementations"
+  subcategories:
+    - subtitle: "Summary"
+      subhref: "/summary.html"
+    - subtitle: "Clozure CL"
+      subhref: "/ccl-setup.html"
+    - subtitle: "CLISP"
+      subhref: "/clisp-setup.html"
+    - subtitle: "SBCL"
+      subhref: "/sbcl-setup.html"
+    - subtitle: "LispWorks CL"
+      subhref: "/lispworks-setup.html"
+
 - title: "IDEs"
   href: "/ides"
   subcategories:
@@ -30,9 +44,6 @@
     - subtitle: "LispWorks CL"
       subhref: "/lispworks-setup.html"
 
-- title: "Libraries"
-  href: "/quicklisp.html"
-
 - title: "Examples"
   href: "/examples"
   subcategories:
@@ -41,20 +52,8 @@
     - subtitle: "Trotter"
       subhref: "/trotter.html"
 
-- title: "Implementations"
-  href: "/implementations"
-  subcategories:
-    - subtitle: "Summary"
-      subhref: "/summary.html"
-    - subtitle: "Clozure CL"
-      subhref: "/ccl-setup.html"
-    - subtitle: "CLISP"
-      subhref: "/clisp-setup.html"
-    - subtitle: "SBCL"
-      subhref: "/sbcl-setup.html"
-    - subtitle: "LispWorks CL"
-      subhref: "/lispworks-setup.html"
-
+- title: "Libraries"
+  href: "/quicklisp.html"
 
 - title: "Who?"
   href: "/about/"