Reorganize repository into monorepo structure

Restructured the project to support multiple frontend applications:
- Move web app to web/ directory
- Create pezkuwi-sdk-ui/ for Polkadot SDK clone (planned)
- Create mobile/ directory for mobile app development
- Add shared/ directory with common utilities, types, and blockchain code
- Update README.md with comprehensive documentation
- Remove obsolete DKSweb/ directory

This monorepo structure enables better code sharing and organized
development across web, mobile, and SDK UI projects.

web/src/pages/Index.tsx

@@ -0,0 +1,14 @@
+
+import React from 'react';
+import AppLayout from '@/components/AppLayout';
+import { AppProvider } from '@/contexts/AppContext';
+
+const Index: React.FC = () => {
+  return (
+    <AppProvider>
+      <AppLayout />
+    </AppProvider>
+  );
+};
+
+export default Index;