(feat): Init concept of coming soon landing page

static/js/main.js

@@ -0,0 +1,18 @@
+document.getElementById("notify-button").addEventListener("click", async () => {
+    const emailInput = document.getElementById("email-input");
+    const email = emailInput.value;
+
+    if (email) {
+        const response = await fetch("/subscribe", {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ email }),
+        });
+
+        const result = await response.json();
+        alert(result.message || result.error);
+        emailInput.value = ""; // Clear input field
+    } else {
+        alert("Please enter a valid email.");
+    }
+});