Portals; Now support a 'Landing' page that Users can view prior to the 'Login' page

A new special Portal Page Id of "LANDING" has been added.

Providing this page is Active and has been flagged to "Allow Unauthenticated Access", it will become the root page when visiting an authenticated Portal, i.e., prior to the Login page being displayed.

The following HTML code shows a simple landing page with a button to direct Users to the Login page:

<h1>The Landing Page</h1>
<button class="is-button" onclick="portal.SignIn()">Login</button>