Wizard: Update the way of adding NTP servers

This updates the way NTP servers can be added:
- helper text was removed
- add button (PlusCircle) was added to the input group utilities
- remove input button is now rendered always, but gets disabled when there's no input
- chip group was moved under the input

Also I've noticed that the "clear input" button completely cleared the list of NTP servers which would make me very angry as a user. Fixed it, so now the clear input button only clears the input field and the `clearNtpServers` action was removed as we don't use it anywhere else.

src/store/wizardSlice.ts

@@ -749,9 +749,6 @@ export const wizardSlice = createSlice({
         1
       );
     },
-    clearNtpServers: (state) => {
-      state.timezone.ntpservers = [];
-    },
   },
 });
 
@@ -818,6 +815,5 @@ export const {
   changeTimezone,
   addNtpServer,
   removeNtpServer,
-  clearNtpServers,
 } = wizardSlice.actions;
 export default wizardSlice.reducer;