docs: add Sourcetrail user documentation to repository

docs/documentation/css/jquery.tocify.css

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+/*
+ * jquery.tocify.css 1.9.0
+ * Author: @gregfranko
+ */
+
+/* The Table of Contents container element */
+.tocify {
+    width: 20%;
+    max-height: 90%;
+    overflow: auto;
+    margin-left: 2%;
+    position: fixed;
+    border: 1px solid #ccc;
+    webkit-border-radius: 6px;
+    moz-border-radius: 6px;
+    border-radius: 6px;
+}
+
+/* The Table of Contents is composed of multiple nested unordered lists.  These styles remove the default styling of an unordered list because it is ugly. */
+.tocify ul, .tocify li {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    border: none;
+    line-height: 30px;
+}
+
+/* Top level header elements */
+.tocify-header {
+    text-indent: 10px;
+}
+
+/* Top level subheader elements.  These are the first nested items underneath a header element. */
+.tocify-subheader {
+    text-indent: 20px;
+    display: none;
+}
+
+/* Makes the font smaller for all subheader elements. */
+.tocify-subheader li {
+    font-size: 12px;
+}
+
+/* Further indents second level subheader elements. */
+.tocify-subheader .tocify-subheader {
+    text-indent: 30px;
+}
+
+/* Further indents third level subheader elements. You can continue this pattern if you have more nested elements. */
+.tocify-subheader .tocify-subheader .tocify-subheader {
+    text-indent: 40px;
+}
+
+/* Twitter Bootstrap Override Style */
+.nav-list > li > a, .nav-list .nav-header {
+    margin: 0px;
+}
+
+/* Twitter Bootstrap Override Style */
+.nav-list > li > a {
+    padding: 5px;
+}

docs/documentation/css/sourcetrail.css

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+.nav-list > .active > a {
+	color: #ffffff;
+	text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.2);
+	background-color: #0088cc;
+}
+
+.nav-list > .active > a:hover {
+	color: #ffffff;
+	text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.2);
+	background-color: #0088cc;
+}
+
+.callout {
+    padding: 20px;
+    margin: 20px 0;
+    border: 1px solid #eee;
+    border-left-width: 5px;
+    border-radius: 3px;
+}
+
+.callout-info {
+    border-left-color: #0088cc;
+}
+
+.callout strong {
+    margin-top: 0;
+    margin-bottom: 5px;
+}
+
+.callout-info strong {
+    color: #0088cc;
+}
+
+img {
+	margin-top: 10px;
+	margin-bottom: 10px;
+}