Docs: (defpred.org) Add HTML export

It looks nice, even if it isn't practically viewable on GitHub.

examples/export/styles/darksun/css/hideshow.css

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+/* hideshow.css --- HideShow CSS file */
+
+/* Copyright (C) 2014 All Right Reserved, Fabrice Niessen */
+
+/* This file is free software: you can redistribute it and/or */
+/* modify it under the terms of the GNU General Public License as */
+/* published by the Free Software Foundation, either version 3 of */
+/* the License, or (at your option) any later version. */
+
+/* This file is distributed in the hope that it will be useful, */
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
+/* GNU General Public License for more details. */
+
+/* Author: Fabrice Niessen <(concat "fniessen" at-sign "pirilampo.org")> */
+/* URL: https://github.com/fniessen/hide-show/ */
+/* Version: 20140912.1722 */
+
+.hsExpanded.hsAnchor {background: #EE7700;}
+
+.buttons {
+    padding: 0px 7px 13px 0px;
+    background: #0A3F69;
+}
+
+.hsButton {
+    color: white;
+    float: right;
+    font-size: 70%;
+    margin-left: 10px;
+}
+
+    .hsButton:hover {
+        text-decoration: underline;
+        cursor: pointer;
+    }
+
+.ellipsis {
+    color: #999999;
+    /* background-color: #FFF8C0; */
+    /* float: right; */
+    margin-left: 0.6em;
+}
+
+.hsReview {
+    border: 1px solid #A4A4A4;
+    background-color: white;
+    z-index: 500; /* must be greater then z-index of hsOverlay */
+    position: relative; /* required for z-index to work */
+}
+
+#hsOverlay {
+    width: 100%;
+    height: 100%;
+    position: fixed;
+    left: 0px;
+    top: 0px;
+    background-color: #000;
+    opacity: .70;
+    z-index: 250; /* must be greater than any other z-index (except the one for .hsReview */
+}
+
+.hsReviewPanel {
+    background-color: #757176;
+    color: white;
+    line-height: 1.1em;
+    margin: 10px 0px;
+    padding: 10px;
+    position: fixed;
+    width: auto;
+    bottom: 0px;
+    right: 0px;
+    z-index: 501;
+    text-align: center;
+}
+
+    .hsReviewPanel.hsReviewing {
+        display: none;
+    }
+
+    .hsReviewPanel:hover {
+        cursor: pointer;
+    }
+
+.hsReviewingPanel {
+    background-color: white;
+    color: #757176;
+    line-height: 1.1em;
+    margin: 10px 0px;
+    padding: 10px;
+    position: fixed;
+    width: auto;
+    bottom: 0px;
+    right: 0px;
+    z-index: 501;
+    text-align: center;
+}
+
+.hsReviewButton:hover {
+    cursor: pointer;
+}
+
+.hsUnselectable {
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+}