Use react-github-corner module and start dateswitchbar component

Also
1. Add empty typedef for react-github-corner
2. Rotate square a+ animation for dateswitchbar component done

src/Components/IsNiftyOpenApp/App.css

@@ -53,14 +53,22 @@
   height: 100%;
 }
 
+.App .top-bar {
+  z-index: 1;
+}
+
 .App .upper-half {
   width: 100%;
   height: 80vh;
+  position: relative;
+  z-index: -1;
 }
 
 .App .lower-half {
   width: 100%;
   height: 20vh;
+  
+  z-index: -1;
 }
 
 .App .OpenXDayMini, .App .NextOpenCloseMini {
@@ -79,11 +87,23 @@
 }
 
 .App .OpenXPlusOneDay-container .OpenXDayMini {
-  border-right: 5px solid rgba(255, 255, 255, 0.6);
+  border-right: 2.5px solid rgba(255, 255, 255, 0.6);
+}
+
+.App .NextOpenClose-container .NextOpenCloseMini {
+  border-left: 2.5px solid rgba(255, 255, 255, 0.6);
 }
 
 .App .NextOpenClose-container {
   float: right;
   width: 50%;
   height: 100%;
+}
+
+.App .DateSwitchBar-container {
+  position: absolute;
+  top: 4vh;
+  left: 50%;
+  width: 75%;
+  transform: translate(-50%, 0);
 }

src/Components/IsNiftyOpenApp/App.tsx

@@ -1,7 +1,9 @@
 import * as React from 'react';
 import { Switch, Route, Redirect } from 'react-router-dom';
 import * as moment from 'moment-timezone';
+import GithubCorner from 'react-github-corner';
 import './App.css';
+import { DateSwitchBar } from '../DateSwitchBar';
 import { OpenXDay } from '../OpenXDay';
 import { OpenXDayMini } from '../OpenXDayMini';
 import { NextOpenCloseMini } from '../NextOpenCloseMini';
@@ -76,6 +78,18 @@ class IsNiftyOpenApp extends React.Component {
 
     return (
       <div className="IsNiftyOpenApp">
+        <div className="top-bar">
+          <GithubCorner
+            href="https://github.com/bendtherules/is-nifty-open"
+            bannerColor="rgb(64, 64, 64)"
+            octoColor="rgba(255, 255, 255, 0.9)"
+            size={80}
+            direction="right"
+          />
+          <div className="DateSwitchBar-container">
+            <DateSwitchBar />
+          </div>
+        </div>
         <div className="upper-half">
           <div className="OpenXDay-container">
             <OpenXDay