[Dart] docs(guide/index): exclude cookbooks from table

Author: chalin

public/docs/ts/_cache/guide/index.jade

@@ -55,7 +55,7 @@ table(width="100%")
     td
       :marked
         In-depth analysis of Angular features and development practices.
-  tr(style=top)
+  tr(style=top if-docs="ts")
     td <b><a href="../cookbook/">Cookbook</a></b>
     td
       :marked

public/docs/ts/latest/guide/index.jade

@@ -55,7 +55,7 @@ table(width="100%")
     td
       :marked
         In-depth analysis of Angular features and development practices.
-  tr(style=top)
+  tr(style=top if-docs="ts")
     td <b><a href="../cookbook/">Cookbook</a></b>
     td
       :marked