add more opengraph properties

public/index.html

@@ -14,15 +14,19 @@
     <script src="clientDetect.js"></script>
 
     <link rel="shortcut icon" href="%PUBLIC_URL%/favicon-192.png" />
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#0e4273" />
 
-    <meta property="og:image" content="%PUBLIC_URL%/logo-512.png">
+    <meta property="og:title"       content="Mandelbrot Maps - Fractal Explorer in WebGL" />
+    <meta property="og:description" content="Mandelbrot Maps is an interactive fractal explorer built using React and WebGL. Come see the pretty side of mathematics!" />
+    <meta property="og:type"        content="website" />
+    <meta property="og:url"         content="https://jmaio.github.io/mandelbrot-maps/" />
+    <meta property="og:image"       content="https://jmaio.github.io/mandelbrot-maps/logo-512.png">
     <!--
       manifest.json provides metadata used when your web app is installed on a
       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
     -->
-    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
     <!--
       Notice the use of %PUBLIC_URL% in the tags above.
       It will be replaced with the URL of the `public` folder during the build.