feat: new onboarding screens (#4)

Changelog:
- Add a custom splash screen
- Redesign the onboarding screen
- Improve UX for the new and import identity screens

Reviewed-on: https://git.reya.su/reya/coop-mobile/pulls/4

composeApp/src/androidMain/kotlin/su/reya/coop/shared/Font.kt

@@ -0,0 +1,13 @@
+package su.reya.coop.shared
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import coop.composeapp.generated.resources.PaytoneOne_Regular
+import coop.composeapp.generated.resources.Res
+import org.jetbrains.compose.resources.Font
+
+@Composable
+fun getExpressiveFontFamily() = FontFamily(
+    Font(Res.font.PaytoneOne_Regular, FontWeight.Normal)
+)