Link up the sidebars to change if signing in/selecting countdown/etc

[willgarrett64]

The sidebars and overlays should now have been built. This issue is to make sure that all the links between them work as expected. Bear in mind that each sidebar isn't actually a separate page, but is in fact just a different view, so they aren't actual links.

These links include the following (but there may be more I forgot):

Sign In sidebar (first sidebar seen when opening site)

• Clicking "Sign In" / "Continue As Guest" will redirect to Select Countdown sidebar (only with a successful login, but for don't worry about this)
• Clicking "Sign Up" will redirect to the Sign Up sidebar

Sign Up sidebar

• Clicking "Create Account" will log the user in (don't worry about this) and redirect to Select Countdown sidebar
• Clicking "Cancel" will redirect back to the Sign In sidebar

Select Countdown sidebar

• Clicking "Add New" will open up the "Create Countdown" overlay
• Clicking "Edit" on any one countdown will also open up the "Create Countdown" overlay

Create Countdown overlay

• Clicking "Save" will save changes (don't worry about this) and close the overlay
• Clicking "Discard" will discard changes (don't worry about this) and close the overlay
• Clicking the "X" will discard changes (don't worry about this) and close the overlay
• Clicking anywhere outside of the overlay will discard changes (don't worry about this) and close the overlay (TBC)

Main Countdown Page

• Clicking "Sign Out" at anytime will redirect the sidebar to the "Sign In" sidebar