Added: Base for subscribe page

I'm new here; please don't kill me.
Added: Page title
Fixed: Sweet lord, this setup is bad
Fixed: Ignore IDEA stuff
Added: More subscription fun
Fixed: Ignore GitHub's no-reply emails
Added: Implementation
Fixed: Show errors
Fixed: Not using numbers
Fixed: Unsubscribe button
Fixed: $email
Added: Info
Fixed: Extra case
Fixed: Label IDs
Updated: Test
Fixed: Input type
Fixed: No-email people
Fixed: Test
Updated: No more test
Added: Test command