Add missing extension files

_extensions/percyfal/nbis-course/partials/logo-hyperlink.html

@@ -0,0 +1,24 @@
+<script type="text/javascript">
+  function hyperlink_logo() {
+    var button = document.createElement( 'div' );
+    button.className = "logo-button";
+    button.id = "logo-button";
+    button.style.visibility = "visible";
+    button.style.position = "absolute";
+    button.style.zIndex = 30;
+    button.style.fontSize = "24px";
+    button.style.left = "130px";
+    button.style.bottom = "14px";
+    button.style.top = "auto";
+    button.style.right = "auto";
+    if (window.location.host.startsWith("localhost")) {
+      button.innerHTML = `<a href="http://${window.location.host}"><i class="fa fa-home"></i></a>`
+    } else {
+      button.innerHTML = '<a href="https://nbis.se"><i class="fa fa-home"></i></a>';
+    }
+    document.querySelector( ".reveal" ).appendChild( button );
+  }
+window.document.addEventListener("DOMContentLoaded", function (event) {
+  hyperlink_logo();
+});
+</script>

_extensions/percyfal/nbis-course/partials/title-slide.html

@@ -0,0 +1,15 @@
+<section id="$idprefix$title-slide"$for(title-slide-attributes/pairs)$ $it.key$="$it.value$"$endfor$>
+  <h1 class="title">$title$</h1>
+$if(subtitle)$
+  <h3 class="subtitle">$subtitle$</h3>
+$endif$
+$for(author)$
+  <h4 class="author">$author$</h4>
+$endfor$
+$for(institute)$
+  <h4 class="institute">$institute$</h4>
+$endfor$
+$if(date)$
+  <h4 class="date">$date$</h4>
+$endif$
+</section>

_extensions/percyfal/nbishome/nbishome.css

@@ -0,0 +1,52 @@
+.reveal .reveal-nbis-home {
+    position: absolute;
+    left: 40px;
+}
+
+.reveal .reveal-nbis-home.reveal-nbis-home-top {
+    top: 13px;
+}
+
+.reveal .reveal-nbis-home.reveal-nbis-home-bottom {
+    bottom: 13px;
+}
+
+.reveal .reveal-nbis-home .reveal-nbis-home-button {
+    display: inline-block;
+    color: $link-color;
+    font-size: .9em;
+    border-radius: 12px;
+    width: 30px;
+    text-align: center;
+    padding: 2px;
+    margin: 0 4px;
+}
+
+.reveal .reveal-nbis-home .reveal-nbis-home-button:hover {
+    color: #ffffff;
+}
+
+.hidden {
+    display: none;
+}
+
+.reveal .reveal-nbis-home .slide-menu-button {
+    position: initial;
+    left: initial;
+    bottom: initial;
+}
+
+.reveal .reveal-nbis-home .slide-menu-button a {
+    color: white;
+}
+
+.reveal .reveal-nbis-home .playback {
+    position: relative;
+    left: 4px;
+    bottom: -17px;
+}
+
+.reveal.paused .reveal-nbis-home .reveal-nbis-home-pause-button {
+    z-index: 110;
+    color: #757575;
+}

_extensions/percyfal/nbishome/nbishome.js

@@ -0,0 +1,44 @@
+window.RevealNbisHome = window.RevealNbisHome || {
+    id: "RevealNbisHome",
+    init: function (deck) {
+	initNBISHome(deck);
+    },
+    configure: function (config) {
+	configure(config);
+    },
+};
+
+// cf chalkboard plugin
+const initNBISHome = function( Reveal ) {
+    var position = { left: "30px", bottom: "30px" };
+    var url = "https://nbis.se";
+
+    var config = configure( Reveal.getConfig()['nbishome'] || {} );
+
+    function configure( config ) {
+	if ( config.url != undefined ) url = config.url;
+	if ( config.position != undefined ) position = config.position;
+	return config
+    }
+
+    var button = document.createElement('div');
+    button.className = 'reveal-nbis-home';
+    button.id = 'reveal-nbis-home';
+    button.style.visibility = 'visible';
+    button.style.position = 'absolute';
+    button.style.zIndex = 30;
+    button.style.fontSize = "24px";
+
+    button.style.left = position.left || "30px";
+    button.style.bottom = position.bottom || "30px";
+
+    button.style.top = position.top || "auto";
+    button.style.right = position.right || "auto";
+
+    button.innerHTML = '<a href="' + url + '" title="Home"><i class="fa fa-home"></i></a>';
+    document.querySelector('.reveal').appendChild(button);
+
+    this.configure = configure;
+
+    return this;
+};