Update settings to have initial pop up with simple actions

[alkrauss48]

Currently the Settings icon in the top left corner takes you over to a Settings Page, but I'd rather it load up a simple popup menu with a few common options, and then have the ability to navigate to the full settings page if the user wants to.

This is the icon, which when clicked currently goes to the Settings page:

But I want it to generate a popup with these features (but styled better):

The links should behave as follows:

• Login - Take you directly (via an inertia-link) to /admin
  • This link should say "Dashboard" if you are logged in. See Settings page link for more details.
• Sign Up - Take you directly (via an inertia-link) to /register
  • This link should hide if you are logged in. See Settings page link for more details.
• All Settings - Take you directly (via an inert-alink) to /settings
• Bottom links
  • YouTube / GitHub Icons (just normal a tags with href properties)
  • Moon icon - this one is a bit more challenging (see settings page). Likely will want to extract out the logic of this icon into its own component, and use it both in this popup menu and the Settings page.