feat: move Configuration menu to Personal settings

ui/src/personal/themeReducer.js

@@ -0,0 +1,8 @@
+import { CHANGE_THEME } from './actions'
+
+export default (previousState = 'DarkTheme', { type, payload }) => {
+  if (type === CHANGE_THEME) {
+    return payload
+  }
+  return previousState
+}