Made content scrollable

Added SingleChildScrollView to new-room, edit-room
and the about-room tab.
NOTE: Added a padding to the new and edit room pages,
to prevent widgets from touching the screen bottom

lib/screens/room/edit.dart

@@ -139,7 +139,9 @@ class _EditRoomPageState extends State<EditRoomPage> {
           tooltip: "Go back",
         ),
       ),
-            body: Center(
+      body: SingleChildScrollView(child: Center(
+          child: Padding(
+            padding: const EdgeInsets.all(14),
             child: ConstrainedBox(
               constraints: const BoxConstraints(maxWidth: 400),
               child: Column(
@@ -239,6 +241,8 @@ class _EditRoomPageState extends State<EditRoomPage> {
                 ],
               )
             )
+          )
+        )
       ),
       floatingActionButton: FloatingActionButton.extended(
         onPressed: () async {

lib/screens/room/new.dart

@@ -56,7 +56,10 @@ class _NewRoomPageState extends State {
           tooltip: "Go back",
         ),
       ),
-            body: Center(
+      body: SingleChildScrollView(
+        child: Center(
+          child: Padding(
+            padding: const EdgeInsets.all(14),
             child: ConstrainedBox(
               constraints: const BoxConstraints(maxWidth: 400),
               child: Column(
@@ -176,6 +179,8 @@ class _NewRoomPageState extends State {
                 ],
               )
             )
+          )
+        )
       ),
       floatingActionButton: FloatingActionButton.extended(
         onPressed: () async {

lib/screens/room/pages/about.dart

@@ -28,7 +28,8 @@ class _AboutRoomPageState extends State<AboutRoomPage> {
     double height = MediaQuery.of(context).size.height;
     double smallest = min(width, height);
 
-    return Center(
+    return SingleChildScrollView(
+      child:Center(
         child: Column(children: [
             // room meta display
             ...(widget.room != null)
@@ -277,6 +278,9 @@ class _AboutRoomPageState extends State<AboutRoomPage> {
               ))
             ]
             : [],
-    ]));
+          ]
+        )
+      )
+    );
   }
 }