feat: NPS score modal

[garethfuller]

Description

Adds NPS score modal integration via Appzi (https://www.appzi.com/).

Type of change

• New feature (non-breaking change which adds functionality)

How should this be tested?

• Perform actions like join/exit/stake/unstake and notice the "How did we do?" button in the modal on success.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
beta-app-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 24, 2023 11:54am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
app-v2	⬜️ Ignored (Inspect)	Visit Preview		Oct 24, 2023 11:54am

[garethfuller]

Waiting on feedback about Appzi usage.