ui: update post link in whats new (#7400)

Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

apps/ios/Shared/Views/Onboarding/WhatsNewView.swift

@@ -672,7 +672,7 @@ private let versionDescriptions: [VersionDescription] = [
     ),
     VersionDescription(
         version: isInUS ? "v7.0.1" : "v7.0",
-        post: nil,
+        post: URL(string: "https://simplex.chat/blog/20260819-simplex-chat-crowdfunding.html"),
         features: (isInUS ? [
             .view(FeatureView(
                 icon: nil,

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/onboarding/WhatsNewView.kt

@@ -944,7 +944,7 @@ private val versionDescriptions: List<VersionDescription> = listOf(
   VersionDescription(
     // the trailing space differs from the previously released "v7.0", so that What's new is shown again
     version = if (isInUs()) "v7.0.1" else "v7.0",
-    post = null,
+    post = "https://simplex.chat/blog/20260819-simplex-chat-crowdfunding.html",
     features = listOf(
       VersionFeature.FeatureView(
         icon = null,