removing unused imports from GithubButton

app_modules/site/components/github-button/index.jsx

@@ -10,14 +10,8 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 */
 
 import React from 'react';
-import ReactDOM from 'react-dom';
 import classNames from 'classnames';
-import { createChainedFunction } from 'app_modules/ui/util/component';
 import protectFromUnmount from 'app_modules/site/util/component/protect-from-unmount';
-import { logCTAEvent } from 'app_modules/site/util/analytics';
-import { Link } from 'react-router';
-import { find } from 'lodash';
-import sitemap from 'app_modules/site/navigation/sitemap';
 import CTALink from 'app_modules/site/components/cta-link';
 import Img from 'app_modules/ui/img';
 import { prefix as pf } from 'app_modules/ui/util/component';