feat: Refactor contact form and improve 404 page

This commit refactors the contact form for better reusability and moves it from the global footer to a dedicated section on the homepage. Additionally, it enhances the user experience on the 404 page.

Key changes:
- The `ContactUsForm` component is now configurable with props for grid layout (`columnsPerRow`) and button text, making it more versatile.
- The contact form has been removed from the shared footer in the main layout and is now explicitly included only on the homepage.
- The 404 "Not Found" page has been updated to include a direct link to the homepage for easier navigation.
- Minor style adjustments were made to the 404 page layout and input field padding for improved visual consistency.

app/(home)/contact-us/page.tsx

@@ -0,0 +1,49 @@
+import ContactUsForm from "@/app/_contact-us/form";
+import { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Opp lens - Contact Us",
+  description:
+    "Automated tender management platform for SMEs. Find tailored tenders, automate document handling, and get real-time alerts. Win more opportunities with less effort.",
+  keywords:
+    "tender management, AI tender search, SME tenders, public procurement, automated bidding, tender alerts",
+  authors: [{ name: "PBL Partners AB" }],
+  openGraph: {
+    title: "Opp lens - AI-Powered Tender Management",
+    description: "Win more tenders automatically with our AI-powered platform",
+    type: "website",
+    locale: "en_US",
+    siteName: "Opp lens",
+  },
+  icons: {
+    icon: "/fav-icon.svg",
+  },
+};
+
+const ContactUsPage = () => {
+  return (
+    <>
+      <div className="flex flex-col gap-6 items-center">
+        <p className="bg-(--primary)/20 w-fit px-2.5 py-1.5 text-(--primary) rounded-full">
+          Contact Us
+        </p>
+        <h1 className="font-extrabold text-5xl">Let's Get In Touch</h1>
+        <p className="text-[16px] font-normal">
+          Or just reach out manually to
+          <a
+            href="mailto:info@opplens.com"
+            className="text-(--primary) mx-1">
+            info@opplens.com
+          </a>
+        </p>
+      </div>
+      <div className="flex flex-col items-center mt-16 px-8 ">
+        <section className="border border-gray-300 rounded-4xl w-full md:max-w-2/3 flex flex-col items-center bg-white">
+          <ContactUsForm columnsPerRow={1} />
+        </section>
+      </div>
+    </>
+  );
+};
+
+export default ContactUsPage;