added back button to map page and auto resized map to accomodate the header

frontEnd/src/components/google-map/google-map.html

-<div #map id="map"></div>
+<ion-header>
+    <ion-navbar>
+        <ion-title>Map</ion-title>
+    </ion-navbar>
+</ion-header>
+
+<ion-content>
+    <div #map id="map"></div>
+</ion-content>

frontEnd/src/components/google-map/google-map.scss

 google-map {
     #map {
         height: 100% !important;
+        background-size: auto;
     }
-}
+}