Restructure command reference

[schlessera]

The current command reference has the following page structure:

- fontpage
  +- command
     +- subcommand
     +- subcommand
  +- command
     +- subcommand
     +- subcommand

The problem with this is that it the frontpage itself is practically empty. It only contains a list command roots together with their (very brief) description:

Command	Description
wp post	Manage posts.
wp post-type	Manage post types.

This page is rather useless on its own, and is basically an oversized navigation menu.

I'd suggest looking into eliminating the second level by adding all command information directly to the frontpage, as an accordeon or similar interface:

Command	Description
wp post	Manage posts.
+-- wp post create	Create a new post.
+-- wp post delete	Delete an existing post.
wp post-type	Manage post types.
+-- wp post-type get	Get details about a registered post type.
+-- wp post-type list	List registered post types.

We can then add an instant search box to that page, which will expand the accordeoan as needed and filter/highlight the lists.

So, in the example above, if I'd type delete in the search box, the page would immediately shrink to this:

Command	Description
wp post	Manage posts.
+-- wp post delete	Delete an existing post.

This will give a proper purpose to this page, as people can easily discover what command they are looking for (provided we improve the descriptions).