ARC-1390 manual vs auto app creation

[rachellerathbone]

This PR includes UI for GHE: this new screen will allow users to select either automatic or manual app creation.

States of this new page:
Initial view

Hover state

There is a pointer cursor in the hover state (you can't see it as it disappears when taking a screenshot).

Version selected

What's not included in this PR:

• navigation between screens. This PR focuses solely on the page and its various states. Navigation between screens will be addressed in issue 1406 after all new screens have been built.
• GHE_SERVER feature flag: not needed until we introduce navigation for the GHE flow (this page is currently not rendered at any point)

[gxueatlassian]

Okay this is really minor. I am happy with the code as it it. It is just suggestions:

It seems we don't need the .data("type") here. We can just do the following:

$(".optionsCard").click(function (event) {
	event.preventDefault();
	$(".optionsCard").removeClass("selected");
  $(event.target).closet('.optionsCard').addClass('selected');
	$(".optionBtn").prop("disabled", false).attr("aria-disabled", "false").addClass("aui-button-primary");
});

So @mboudreau opinions? You mentioned the "data('type')" yesterday, I want to ask your thoughts.

---

for this, we could replace the
$(event.target).closet('.optionsCard').addClass('selected');
to
$(event.currentTarget).addClass('selected');