Improve question subscription flow

[smallbrownbike]

Currently, our question subscribe button shows a tooltip if not logged in: "Sign in to subscribe"

Changes

• Makes the button open an auth form when clicked (if the user isn't signed in) then subscribes them to the question after successfully authenticated
• Refactors setSubscription function in useUser a bit to make this work

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
posthog	✅ Ready (Inspect)	Visit Preview	Jun 14, 2024 2:34pm

[corywatilo]

It looks like we lost the tooltip on the logged out state? (As a user, I want to know what this button does before I press it.)

[smallbrownbike]

Whoops! Fixed