remove old support tab

src/app/support-tab.js

-var yo = require('yo-yo')
-
-// -------------- styling ----------------------
-var csjs = require('csjs-inject')
-var styleGuide = require('./style-guide')
-var styles = styleGuide()
-
-var css = csjs`
-  .supportTabView {
-    height: 100vh;
-    padding: 2%;
-    padding-bottom: 3em;
-    display: flex;
-    flex-direction: column;
-    overflow: hidden;
-  }
-  .chat extends ${styles.displayBox} {
-    display: flex;
-    flex-direction: column;
-    align-items: center;
-    height: 85%;
-  }
-  .chatTitle {
-    cursor: pointer;
-    height: 40px;
-    width: 90%;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    border-radius: 3px;
-    background-color: white;
-    border: 2px dotted ${styles.colors.lightGrey};
-  }
-  .chatTitle:hover {
-    background-color: ${styles.colors.lightYellow};
-  }
-  .icon {
-    height: 70%;
-    margin-right: 2%;
-  }
-  .chatTitleText {
-    font-size: 13px;
-    font-weight: bold;
-  }
-  .chatTitleText {
-    opacity: 0.8;
-  }
-  .chatIframe {
-    width: 100%;
-    height: 100%;
-    border: 2px dotted ${styles.colors.lightGrey};
-    overflow: hidden;
-    transform: scale(0.9);
-  }
-  .infoBox extends ${styles.infoTextBox}{
-
-  }
-`
-
-var infoText = yo`
-  <div>
-    Have a question, found a bug or want to propose a feature? Have a look at the
-    <a href='https://github.com/ethereum/browser-solidity/issues'> issues</a> or check out
-    <a href='https://remix.readthedocs.io/en/latest/'> the documentation page on Remix</a> or
-    <a href='https://solidity.readthedocs.io/en/latest/'> Solidity</a>.
-  </div>
-`
-
-module.exports = supportTab
-
-function supportTab (container, appAPI, events, opts) {
-  var el = yo`
-    <div class="${css.supportTabView} "id="supportView">
-      <div>
-        <div class="${css.infoBox}">
-          ${infoText}
-        </div>
-      </div>
-      <div class="${css.chat}">
-        <div class="${css.chatTitle}" onclick=${openLink} title='Click to open chat in Gitter'>
-          <img class="${css.icon}" title="Solidity" src="assets/img/remix_logo_512x512.svg">
-          <div class="${css.chatTitleText}">ethereum/remix community chat</div>
-        </div>
-        <iframe class="${css.chatIframe}" src='https://gitter.im/ethereum/remix/~embed'>
-      </div>
-    </div>
-  `
-  container.appendChild(el)
-}
-
-function openLink () {
-  window.open('https://gitter.im/ethereum/remix')
-}