Add category post counts

- Add pagination (WIP)
- Tweak admin category/post list pages

src/MyWebLog/Program.fs

@@ -17,8 +17,7 @@ type WebLogMiddleware (next : RequestDelegate) =
             | Some webLog ->
                 WebLogCache.set ctx webLog
                 do! PageListCache.update ctx
-                let! cats = Data.Category.findAllForView webLog.id conn
-                CategoryCache.set ctx cats
+                do! CategoryCache.update ctx
                 return! next.Invoke ctx
             | None -> ctx.Response.StatusCode <- 404
     }