moved all sources to src directory

src/public/javascripts/setup.js

@@ -0,0 +1,34 @@
+$("#setup-form").submit(() => {
+    const username = $("#username").val();
+    const password1 = $("#password1").val();
+    const password2 = $("#password2").val();
+
+    if (!username) {
+        showAlert("Username can't be empty");
+        return false;
+    }
+
+    if (!password1) {
+        showAlert("Password can't be empty");
+        return false;
+    }
+
+    if (password1 !== password2) {
+        showAlert("Both password fields need be identical.");
+        return false;
+    }
+
+    server.post('setup', {
+        username: username,
+        password: password1
+    }).then(() => {
+        window.location.replace("/");
+    });
+
+    return false;
+});
+
+function showAlert(message) {
+    $("#alert").html(message);
+    $("#alert").show();
+}