Improve onboarding experience

[clearlysid]

Onboarding process on both macOS and Windows is suboptimal.

1. If someone clicks the "Get started" button without fully reading the text, they miss out on how the app works and what keyboard shortcut to summon it with. This leads to a lot of confusion and DMs stating "the app is not opening.."
2. On macOS, the screen recording permissions flow is glitchy. People are forced to re-grant the permission after every install/update. To do this they need to first remove the app from the list with the "-" butto, then reopen the app and finally re-add the permission. If not done in this exact sequence, things don't work and people tend to give up.

[clearlysid]

Reopening because permissions was only half the battle. The other half is designing a beautiful welcome screen and make it clear how the app works 🔥