Add theme colors

Author: Ives van Hoorne

packages/app/src/app/index.html

@@ -19,6 +19,7 @@
   <meta property="twitter:image:src" content="https://codesandbox.io/static/img/banner.png">
   <meta property="twitter:image:width" content="1200">
   <meta property="twitter:image:height" content="630">
+  <meta name="theme-color" content="#6CAEDD">
   <meta name="description" content="CodeSandbox is an online editor tailored for web applications.">
   <link rel="shortcut icon" href="/favicon.ico">
   <link rel="manifest" href="/manifest.json">

packages/app/src/embed/index.html

@@ -20,6 +20,7 @@
   <meta property="twitter:image:src" content="https://codesandbox.io/static/img/banner.png">
   <meta property="twitter:image:width" content="1200">
   <meta property="twitter:image:height" content="630">
+  <meta name="theme-color" content="#6CAEDD">
   <meta name="description" content="CodeSandbox is an online editor tailored for web applications.">
   <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700" rel="stylesheet">
   <link rel="manifest" href="/manifest.json">

packages/homepage/src/html.js

@@ -36,6 +36,7 @@ export default class HTML extends Component {
           />
           <meta property="og:type" content="website" />
           <meta property="og:author" content="https://ivesvh.com" />
+          <meta name="theme-color" content="#6CAEDD" />
           <meta
             property="og:image"
             content="https://codesandbox.io/static/img/banner.png"