💄 Modal pop-ups for Subscriptions

[joshbermanssw]

General Contributing:

As per @adamcogan's email (made into #1753 ), this PR involves improving from the vanilla JS alerts when subscribing - instead we have used reactive modals. Based off of the designers wireframes this is the product.

**Figure: Error subscribing modal** **Figure: Success subscribing modal**

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Name	Status	Preview	Comments	Updated (UTC)
tina-io	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2024 7:28am

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