Remove simple landing page to use full marketing page

- Delete app/page.tsx to let app/(marketing)/page.tsx be the root
- Full marketing page has Hero, Features, Pricing, etc.
- Much better for vibnai.com root domain

Co-authored-by: Cursor <cursoragent@cursor.com>

app/page.tsx

@@ -1,91 +0,0 @@
-"use client";
-
-import Link from "next/link";
-import { Button } from "@/components/ui/button";
-import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
-
-export default function HomePage() {
-  return (
-    <div className="flex min-h-screen items-center justify-center bg-background p-4">
-      <div className="w-full max-w-2xl space-y-6">
-        {/* Logo */}
-        <div className="flex justify-center">
-          <img 
-            src="/vibn-black-circle-logo.png" 
-            alt="Vib'n" 
-            className="h-24 w-24"
-          />
-        </div>
-
-        {/* Welcome Card */}
-        <Card>
-          <CardHeader className="space-y-1">
-            <CardTitle className="text-3xl font-bold text-center">
-              Welcome to Vib'n
-            </CardTitle>
-            <CardDescription className="text-center text-lg">
-              Your AI-powered development platform
-            </CardDescription>
-          </CardHeader>
-          <CardContent className="space-y-6">
-            <div className="text-center space-y-4">
-              <p className="text-muted-foreground">
-                Track, manage, and deploy your AI-coded projects with ease.
-              </p>
-              
-              <div className="grid gap-4 md:grid-cols-3">
-                <Card className="bg-muted/50">
-                  <CardContent className="pt-6">
-                    <div className="text-3xl mb-2">🚀</div>
-                    <h3 className="font-semibold mb-1">Fast Deployment</h3>
-                    <p className="text-xs text-muted-foreground">
-                      Deploy to Coolify with one click
-                    </p>
-                  </CardContent>
-                </Card>
-                
-                <Card className="bg-muted/50">
-                  <CardContent className="pt-6">
-                    <div className="text-3xl mb-2">🤖</div>
-                    <h3 className="font-semibold mb-1">AI-Powered</h3>
-                    <p className="text-xs text-muted-foreground">
-                      Track AI coding sessions
-                    </p>
-                  </CardContent>
-                </Card>
-
-                <Card className="bg-muted/50">
-                  <CardContent className="pt-6">
-                    <div className="text-3xl mb-2">📊</div>
-                    <h3 className="font-semibold mb-1">Analytics</h3>
-                    <p className="text-xs text-muted-foreground">
-                      Monitor project progress
-                    </p>
-                  </CardContent>
-                </Card>
-              </div>
-
-              <div className="pt-6 flex gap-4 justify-center">
-                <Button size="lg" asChild>
-                  <Link href="/auth">
-                    Get Started
-                  </Link>
-                </Button>
-                <Button size="lg" variant="outline" asChild>
-                  <a href={process.env.NEXT_PUBLIC_PROXY_URL || "#"} target="_blank" rel="noopener noreferrer">
-                    API Docs
-                  </a>
-                </Button>
-              </div>
-            </div>
-          </CardContent>
-        </Card>
-
-        {/* Features */}
-        <div className="text-center text-sm text-muted-foreground">
-          <p>✅ Self-hosted • ✅ Open source • ✅ Powered by Coolify</p>
-        </div>
-      </div>
-    </div>
-  );
-}