QSS: User should be able to opt-in/out

[holmesworcester]

UPDATED

We are adding QSS (Quiet Storage Service) to support iOS notifications, speed up joining, and provide an alternative mechanism to Tor for moving community data.

For community creators:

• Community creators should be: prompted to add a server when they invite members.
• This prompt should explain the benefits of the server, explain that Quiet will not work well on iOS without it
• They should be able to use their own server, not use a server, or use ours.
• The prompt should appear until they add a server or until they choose "don't show this again".
• Community creators should also be able to add a server in settings.
• We should never contact QSS if they don't choose to use a server.
• They should have to create an account.

For invitees joining:

• Invitees should see a clear notice that a server is being used. (For now, we will not allow non-Quiet servers to be used. In the future we will also want a clear warning when a server is being used that is not Quiet.)
• It should be clear that Tor isn't being used
• If a server is being used that is not Quiet's server, they should see a clear warning of this.
• They should see links to terms of service and a privacy policy, and be able to agree to them.
• If a community uses a server, they should not be able to not use the server, since this will make the community unreliable for iOS users.

[holmesworcester]

Another optional thing we can do here is to consider #2442

[holmesworcester]

Here's some work in progress:

https://www.figma.com/file/y8h6w8PYR9jyI3zjYHL9Cl/Mobile-%2B-desktop-%2B-prototypes?type=design&node-id=1427-34497&mode=design&t=qxsYkljhpdNnRgwz-0

... But in the course of that work I had a better idea:

When people join the community, we can tell them on the username screen, before they start the network or connect to anything, what the "network approach" is of the community they are joining. That way only the community creator has to choose.

[holmesworcester]

User already has Quiet: https://www.figma.com/proto/8gOWYuzQPydMmIb09Cz8gh/Community-joining%2Fcreating-%2B[…]in-zoom&starting-point-node-id=828%3A7427&show-proto-sidebar=1 User doesn't have Quiet: https://www.figma.com/proto/8gOWYuzQPydMmIb09Cz8gh/Community-joining%2Fcreating-%2B[…]n-zoom&starting-point-node-id=819%3A11528&show-proto-sidebar=1 And here is the flow for creating community with QSS (mockups only, not clickable prototypes): https://www.figma.com/file/8gOWYuzQPydMmIb09Cz8gh/Community-joining%2Fcreating-%2B-[…]type=design&node-id=811-20890&mode=design&t=qmX2Z8BWj2B8uv98-4