feat: add routing

src/components/Navbar/Navbar.js

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+import React from "react";
+import { Link } from "react-router-dom";
+
+const Navbar = () => (
+  <div>
+    <ul>
+      <li>
+        <Link to={"/"}>Landing</Link>
+      </li>
+      <li>
+        <Link to={"/signin"}>Sign In</Link>
+      </li>
+      <li>
+        <Link to={"/user"}>Account</Link>
+      </li>
+    </ul>
+  </div>
+);
+
+export default Navbar;

src/components/Navbar/index.js

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+import Navbar from "./Navbar";
+export default Navbar;

src/components/screens/Day/Day.js

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+import React from "react";
+
+const Day = () => <div>Day</div>;
+
+export default Day;

src/components/screens/Day/index.js

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+import Day from "./Day";
+export default Day;

src/components/screens/Month/Month.js

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+import React from "react";
+
+const Month = () => <div>Month</div>;
+
+export default Month;

src/components/screens/Month/index.js

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+import Month from "./Month";
+export default Month;

src/components/screens/User/User.js

@@ -1,5 +1,5 @@
 import React from "react";
-import fire from "../fire.js";
+import fire from "../../../fire.js";
 
 class User extends React.Component {
   state = {

src/components/screens/User/index.js

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+import User from "./User";
+export default User;

src/components/screens/Year/Year.js

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+import React from "react";
+
+const Year = () => <div>Year</div>;
+
+export default Year;

src/components/screens/Year/index.js

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+import Year from "./Year";
+export default Year;