get intended-ui imported and add splash page

assets/js/pages/SplashPage.tsx

@@ -0,0 +1,24 @@
+import React from "react";
+
+import { CenteredContainer, SplashIconHeader, Header1, Header3, Spacer, Button } from '@intended/intended-ui';
+
+const SplashPage = () => {
+  return (
+    <CenteredContainer fullscreen>
+      <CenteredContainer wide>
+        <SplashIconHeader />
+        <Header1>Securely Share Your Secrets</Header1>
+        <Header3>
+          With Intended Link you can easily share messages and files securely
+          and secretly.
+        </Header3>
+        <Spacer />
+        <Button variant="secondary" boldFont onClick={() => {}}>
+          START SHARING
+        </Button>
+      </CenteredContainer>
+    </CenteredContainer>
+  );
+};
+
+export default SplashPage;