Update Open Graph and Twitter Card content

Update links to mnito.github.io/factors-game/
Add new screenshot with aspect ratio optimized for OG and Twitter Card
Update image to new screenshot for Open Graph and Twitter Card

index.html

@@ -9,13 +9,13 @@
         <meta name="application-name" content="Factors Game">
         <meta property="og:title" content="Factors Game - The 🐐 of Fun Math Games">
         <meta property="og:type" content="website">
-        <meta property="og:image" content="https://factorsgame.com/screenshots/screenshot-level-2.png">
+        <meta property="og:image" content="https://mnito.github.io/factors-game/etc/screenshots/level-1-night-rainbow-screenshot-wide-large.png">
         <meta property="og:description" content="Twisting the very rules of math and increasingly challenging your skills, use addition and division to get your number as close to 1 as possible. Can you get to 1? Find out now right in your browser!">
-        <meta property="og:url" content="https://factorsgame.com/">
+        <meta property="og:url" content="https://mnito.github.io/factors-game/">
         <meta name="twitter:card" content="summary_large_image">
         <meta name="twitter:title" content="Factors Game - The 🐐 of Fun Math Games">
         <meta name="twitter:description" content="Twisting the very rules of math and increasingly challenging your skills, use addition and division to get your number as close to 1 as possible. Can you get to 1? Find out now right in your browser!">
-        <meta name="twitter:image" content="https://factorsgame.com/screenshots/screenshot-level-2.png">
+        <meta name="twitter:image" content="https://mnito.github.io/factors-game/etc/screenshots/level-1-night-rainbow-screenshot-wide-large.png">
         <link rel="icon" type="image/png" href="favicon.png">
         <style type="text/css">
             html, body {