In-feed notices: Join rewards flow

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## Goal

- Make the flow for onboarding into Rewards program accessible on mobile web
- Increase the % of authentic new users who join rewards
- Decrease the % of inauthentic new users who join rewards

## What needs to be done

1. Create 3x new in-feed notices that advance the user through the rewards onboarding process.
2. Remove the `Complete to earn tokens` component from the sidebar

| Notice                       | Description                                                                                                                                    | Dismissable | Position | Sticky | Display priority | Conditions                                                                                                                                                                                         | Primary action                                                            |
|------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------|-------------|----------|--------|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------|
| Who is @username?            | Let the Minds community know who you are by decking out your channel page. This step is required to join the token rewards program.            | Yes         | In-feed  | No     | 2.2              | User has not uploaded avatar, banner, and/or added a bio                                                                                                                                           | Set up my channel (launches channel setup modal)                          |
| You're invited! Join rewards | Verify your uniqueness to get started earning token rewards for engagement on your content.                                                    | Yes         | In-feed  | No     | 2.3              | User has already: (1) Verified their email, (2) selected interest tags, (3) set up channel with a name, avatar, and bio, (4) made at least one post, and (5) their account is at least 3 days old. | Verify uniqueness (launches Phone Verification > Connect to Wallet modal) |
| Connect a crypto wallet      | To earn tokens and access the decentralized web, connect Minds to your crypto wallet. This step is required to join the token rewards program. | Yes         | In-feed  | No     | 2.4              | User has satisfied all requirements for being invited to rewards, and has verified their uniqueness.                                                                                               | Connect wallet (launches Connect Wallet modal)                            |

## QA

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Consideration is given to how the issue will be demoed and tested prior to being deployed
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## UX/Design

This should use the existing component for in-feed notices.

## Personas

- New users
- Content creators who will benefit from rewards

## Experiments

We should deploy this change via an experiment, with:
- (a) the control variant, in which `Complete to earn tokens` is in the sidebar and no new in-feed notices, and
- (b) the test variant with `Complete to earn tokens` removed form the sidebar and the new in-feed notices introduced.

## Acceptance Criteria

- [ ] Backend API that returns the display logic for in feed notices
- [ ] The in-feed notices described above appear in the Newsfeed under the conditions described
- [ ] Each notice launches the appropriate modal that the user can complete
- [ ] When a modal is completed, the in-feed notice is removed from the Newsfeed

## Definition of Ready Checklist

- [ ] Definition Of Done (DoD)
- [x] Acceptance criteria
- [ ] Weighted
- [ ] QA
- [x] UX/Design
- [x] Personas
- [x] Experiments

Story points: 8.0