Add table headers to example index files

htmlify.pl

@@ -56,9 +56,10 @@
         my @files = files-in-category($category);
         my @filenames = @files.map: {.basename};
         my @pod-links = @filenames.map: {pod-link($_, "categories/$category/$_")};
+        my @headers = qw{File Title Author};
         spurt "html/$category.html", p2h(
             pod-with-title($title,
-                pod-table(@pod-links),
+                pod-table(@pod-links, headers => @headers),
             ),
         );
     }

lib/Pod/Convenience.pm6

@@ -93,9 +93,9 @@ sub pod-heading($name, :$level = 1) is export {
     );
 }
 
-sub pod-table(@contents) is export {
+sub pod-table(@contents, :@headers) is export {
     Pod::Block::Table.new(
-        :@contents
+        :@contents, :@headers
     )
 }