Create pattern for hosting page

[bengreeley]

Creates a new pattern for the hosting page, which will be used at https://wordpress.org/hosting.

To test, create a new page with the slug hosting-2, verify that when viewing the page the new hosting page content loads. (see screenshot).

Note that this PR is temporarily making changes to https://wordpress.org/hosting-2/ until launch. Launching will be replacing the instance of hosting-2 with hosting in theme-switcher.php