Began work on new order form

https://thehostingtool.com/forum/thread-2936.html

Domain/subdomain selection has been moved away from step 1. It's been
replaced with a customizable (HTML) welcome message which can be used
to give users further instructions. Form currently operates up to step
3. A custom Readmore.js has been implemented to nicely truncate long
package descriptions.

An alternative sliding effect can be enabled from within the ACP but
it's disabled by default because it can be disorienting and may not
work properly in all browsers.