ux: Simplify Onboarding

This patch simplifies the onboarding flow based on Jeroen's suggestions.

Setup view:
  - Removes extra nostr information
  - Only shows two buttons, create account and sign in.

Create Account view:
  - When a user uploads a photo it is now displayed
  - Name is now required
  - Public key is now hidden
  - Create account model has been updated to match metadata

Save Keys view:
  - Removes the requirement to copy the nsec
  - Simplified explanation
  - Only shows two buttons, save and not now

Testing
——
iPhone 15 Pro Max (17.0) Light Mode:
https://v.nostr.build/3P75x.mp4

iPhone SE (3rd generation) (16.4) Dark Mode:
https://v.nostr.build/wGBQL.mp4

——

Changelog-Fixed: Create Account model now uses correct metadata
Changelog-Changed: Onboarding design

damus/Models/CreateAccountModel.swift

@@ -9,31 +9,31 @@ import Foundation
 
 
 class CreateAccountModel: ObservableObject {
-    @Published var real_name: String = ""
-    @Published var nick_name: String = ""
+    @Published var display_name: String = ""
+    @Published var name: String = ""
     @Published var about: String = ""
     @Published var pubkey: Pubkey = .empty
     @Published var privkey: Privkey = .empty
     @Published var profile_image: URL? = nil
 
     var rendered_name: String {
-        if real_name.isEmpty {
-            return nick_name
+        if display_name.isEmpty {
+            return name
         }
-        return real_name
+        return display_name
     }
     
     var keypair: Keypair {
         return Keypair(pubkey: self.pubkey, privkey: self.privkey)
     }
     
-    init(real: String = "", nick: String = "", about: String = "") {
+    init(display_name: String = "", name: String = "", about: String = "") {
         let keypair = generate_new_keypair()
         self.pubkey = keypair.pubkey
         self.privkey = keypair.privkey
 
-        self.real_name = real
-        self.nick_name = nick
+        self.display_name = display_name
+        self.name = name
         self.about = about
     }
 }