Add modal for export method selection in AdminPage and update export filename based on hosting type

src/app/api/admin/export/route.ts

@@ -3,6 +3,9 @@ import { NextResponse } from 'next/server';
 import { statSync, createReadStream, existsSync } from 'fs';
 import path from 'path';
 
+// This is the route for exporting posts when using the docker production server
+// If you try this on the local server, it will fail because the posts directory is not on the local server
+
 export async function GET() {
   try {
     const dockerDir = '/app/docker'; // update this to your actual path