Greeting screen on first startup

[Disti4ct]

Goal: when the user launches this app for the first time, we need to display a new page with the following content:

Hello! Let's connect this domain to your wallet address. Do you want to set <replace this with user address: 0x...> address as the owner of <replace with a current domain: window.location.hostname || document.location.host>? Then only you can access and change the settings of the app.

Next we have a short notice with a bold text (some styles to be sure users see it):

If you want to change the address, switch to another address. If you can't switch, just disconnect your wallet and connect it to the new address.

And finally we have buttons:

1. Disconnect
2. Set my address as the owner

approximate plan:
Create a new component (follow the file structure and rules): GreetingScreen/index.tsx. Import it inside src/pages/App.tsx. Display this component in case if !appIsReady (maybe before <Connection />).

• wait for a while. We cannot just set a new admin, with this flow we have to deploy Factory + Router. Maybe it's better to complete it first: #102