Rewrite wiki page with react (#2258)

frontend/src/css/wiki.css

@@ -0,0 +1,89 @@
+.wiki-side-nav {
+  flex:auto;
+  display:flex;
+  flex-direction:column;
+  overflow:hidden; /* for ff */
+  border-right:1px solid #eee;
+  background: #f5f7fa;
+}
+
+.wiki-pages-heading {
+  font-size: 1rem;
+  font-weight: normal;
+  text-align:center;
+  padding:.5rem 0rem;
+  border-bottom:1px solid #e8e8e8;
+  line-height: 1.5;
+  height:40px;
+}
+.wiki-pages-container {
+  overflow: hidden;
+  padding-bottom: 10px;
+}
+.wiki-pages-container:hover {
+  overflow: auto;
+}
+.wiki-pages-container .tree-view {
+  padding-left:0;
+}
+
+.wiki-md-viewer-rendered-content {
+  padding: 30px 0 0;
+}
+.wiki-pages-container .tree-node-inner {
+  line-height: 1.625;
+}
+.wiki-pages-container .folder-toggle-icon {
+  color: #c0c0c0;
+  line-height: 1.625;
+}
+.wiki-pages-container .tree-node-icon {
+  color: #b0b0b0;
+}
+.wiki-main .cur-view-path {
+  border-bottom: 1px solid #e8e8e8;
+  margin-bottom: 8px;
+}
+.wiki-main .cur-view-path::after {
+  display:none;
+}
+.wiki-main .cur-view-main-con {
+  padding-left: 40px;
+  padding-right: 40px;
+}
+
+.wiki-page-ops {
+    position:fixed;
+    top:10px;
+}
+
+@media (min-width: 768px) {
+    .wiki-page-ops:before {
+        content:'';
+        border-left:1px solid #ddd;
+        position:absolute;
+        top:3px;
+        left:-16px;
+        bottom:3px;
+    }
+}
+
+.wiki-page-list-item {
+    word-break:break-all;
+    line-height:1.6;
+    margin:3px 0;
+}
+
+.wiki-page-link,
+.wiki-page-link:hover {
+   font-size:1.15em;
+   font-weight:normal;
+   color:#444;
+   margin-left:5px;
+}
+
+#wiki-page-last-modified {
+    margin-top:40px;
+    font-size:12px;
+    color: #666;
+}