Allow adding, updating and deleting indices (#24)

* Allow adding indices

* Allow deleting indices

* Allow updating the indices

* When there are multiple indices, group them below Indices tab

* Update elem classes

libs/ktem/ktem/assets/css/main.css

@@ -53,6 +53,7 @@ button.selected {
 }
 
 #chat-tab,
+#indices-tab,
 #settings-tab,
 #help-tab,
 #resources-tab,
@@ -98,7 +99,8 @@ button.selected {
 .setting-answer-mode-description {
   margin: 5px 5px 2px !important;
 }
-*/ mark {
+
+mark {
   background-color: #1496bb;
 }