Remove unnecessary argument

src/App.jsx

@@ -6,7 +6,7 @@ import Feed from './Feed.jsx';
 import Navigator from './Navigator.jsx';
 import Call from './Call.jsx';
 
-function fetchActivities(setStack) {
+function fetchActivities() {
 	return fetch('https://aircall-job.herokuapp.com/activities')
 		.then(response => {
 		return response.json()

src/Call.jsx

@@ -1,5 +1,6 @@
 import React, {useState, useEffect} from 'react';
 
+// Icons could be moved to their own file in the future
 function ContactIcon() {
 	return (
 <svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg"
@@ -54,6 +55,7 @@ function moveCall(call, update) {
 	})
 }
 
+// Displays details of specific calls
 function Call(props) {
 	return (
 		<div className="fade-in call">