show install MIH only for Web

Frontend/lib/mih_packages/authentication/register.dart

@@ -239,8 +239,10 @@ class _RegisterState extends State<Register> {
     });
   }
 
-  MIHAction getSecondaryActionButton() {
-    return MIHAction(
+  Widget getSecondaryActionButton() {
+    return Visibility(
+      visible: MzanziInnovationHub.of(context)!.theme.getPlatform() == "Web",
+      child: MIHAction(
         icon: Padding(
           padding: const EdgeInsets.all(10.0),
           child: SizedBox(
@@ -266,6 +268,7 @@ class _RegisterState extends State<Register> {
             arguments: 0,
           );
         },
+      ),
     );
   }
 

Frontend/lib/mih_packages/authentication/signin.dart

@@ -1,5 +1,4 @@
 import 'dart:convert';
-
 import 'package:mzansi_innovation_hub/mih_components/mih_package_components/mih_icons.dart';
 import 'package:mzansi_innovation_hub/mih_objects/arguments.dart';
 import 'package:flutter/material.dart';
@@ -287,8 +286,10 @@ class _SignInState extends State<SignIn> {
     );
   }
 
-  MIHAction getSecondaryActionButton() {
-    return MIHAction(
+  Widget getSecondaryActionButton() {
+    return Visibility(
+      visible: MzanziInnovationHub.of(context)!.theme.getPlatform() == "Web",
+      child: MIHAction(
         icon: Padding(
           padding: const EdgeInsets.all(10.0),
           child: SizedBox(
@@ -314,6 +315,7 @@ class _SignInState extends State<SignIn> {
             arguments: 0,
           );
         },
+      ),
     );
   }