Improve the init command #519
Description
Some suggestions for improving the init command (can be broken down to multiple PRs):
The default starter site can be enhanced to make it more useful to the user as a starting point. e.g., create a site that has all typical features (i.e., top nav, site nav, footer, search, a bunch of pages typically used such as home, contact, docs etc.) so that the user can go from there to a production website with least amount of effort.
Perhaps we can have other options?
--minimal: create an empty site
--convert: converts an existing site to a MarkBind site. This can be an 'intelligent' conversion e.g., deduce siteNav items based on page titles
--restore: restores the folder to the previous state (i.e., reverses the init command)