refactor lib: clean directories + clean options + add theming capabilities + remove usage of ionicon (for arrows)

example/app.js

@@ -0,0 +1,27 @@
+import Vue from 'vue';
+import JsonViewer from '../lib';
+import './css/ionicons.css';
+
+new Vue({
+    el: '#app',
+    data() {
+        return {
+            jsonData: {
+                name: [
+                  {key: 2},
+                  {key: 'hello word'},
+                ],
+                val: {
+                  c: function() {},
+                  b: 'a',
+                  a: 'hello word',
+                  asd2: 1,
+                  asd: false,
+                  foo: null,
+                  bar: undefined
+                }
+              }
+        }
+    },
+    components: {JsonViewer}
+})