KaTeX website & documentation (#1484)

* website/docs: initial commit

* Change secondaryColor

* Fix index.css not being copied and included on global stylesheet

* Fix stylesheet link

[skip ci]

* Change documentation link to API(Usage)

[skip ci]

* Add `Libraries` in usage

[skip ci]

* Remove documentation from `README.md` and add link to the site

[skip ci]

* Use KaTeX in the parent directory to build Markdown

[skip ci]

* Revise function support page. Avoid error msgs.

* General edit to function support page

website/siteConfig.js

@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// See https://docusaurus.io/docs/site-config.html for all the possible
+// site configuration options.
+
+/* List of projects/orgs using your project for the users page */
+const users = [
+  {
+    caption: 'GitLab',
+    image: 'https://gitlab.com/gitlab-com/gitlab-artwork/raw/master/logo/logo-square.png',
+    infoLink: 'https://gitlab.com/',
+    pinned: true,
+  },
+];
+
+const siteConfig = {
+  title: 'KaTeX',
+  tagline: 'The fastest math typesetting library for the web',
+  url: 'https://khan.github.io',
+  baseUrl: '/KaTeX/',
+
+  // Used for publishing and more
+  projectName: 'KaTeX',
+  organizationName: 'Khan',
+
+  headerLinks: [
+    {doc: 'node', label: 'Docs'},
+    {page: 'users', label: 'Users'},
+    {href: 'https://github.com/Khan/KaTeX', label: 'GitHub'},
+    {search: true},
+  ],
+
+  // If you have users set above, you add it here:
+  users,
+
+  /* path to images for header/footer */
+  headerIcon: 'img/katex-logo.svg',
+  footerIcon: 'img/katex-logo.svg',
+  favicon: 'https://khan.github.io/favicon.ico',
+
+  disableHeaderTitle: true,
+
+  /* colors for website */
+  colors: {
+    primaryColor: '#329894',
+    secondaryColor: '#266e6c',
+  },
+
+  // This copyright info is used in /core/Footer.js and blog rss/atom feeds.
+  copyright:
+    'Copyright © ' +
+    new Date().getFullYear() +
+    ' Khan Academy',
+
+  highlight: {
+    // Highlight.js theme to use for syntax highlighting in code blocks
+    theme: 'default',
+  },
+
+  markdownPlugins: [function(md) {
+    md.use(require('./remarkableKatex'));
+  }],
+
+  scripts: ['https://buttons.github.io/buttons.js'],
+  stylesheets: ['https://cdn.jsdelivr.net/npm/katex@0.10.0-beta/dist/katex.min.css'],
+
+  separateCss: ['static/static', 'static\\static'],
+
+  /* On page navigation for the current documentation page */
+  onPageNav: 'separate',
+
+  /* Open Graph and Twitter card images */
+  ogImage: 'img/og_logo.png',
+  twitterImage: 'img/og_logo.png',
+
+  repoUrl: 'https://github.com/Khan/KaTeX',
+};
+
+module.exports = siteConfig;