Edit Homepage to Not Display Images on Mobile (#940)

## Description

### Why
Edit homepage to not display images when webpage is being viewed on
mobile. 'Prettier' was run on the source code creating more changes.
Only changes to `index.js` were to add the new HomePageImage class to
the image's that should not be displayed on mobile.

### BEFORE
<img width="391" alt="image"
src="https://github.com/microsoft/react-native-windows-samples/assets/34109996/85f7fec4-ad2d-4e09-b660-e8dbd0457823">

### AFTER
<img width="389" alt="image"
src="https://github.com/microsoft/react-native-windows-samples/assets/34109996/975c6d56-923a-46f4-9dda-a171a0f62b48">

###### Microsoft Reviewers: [Open in
CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/microsoft/react-native-windows-samples/pull/940)

Author: chiaramooney

website/pages/en/index.js

@@ -263,6 +263,7 @@ class Index extends React.Component {
           <div className="row">
             <div className="column">
               <img
+                className="HomePageImage"
                 style={{
                   maxWidth: "200%",
                   marginLeft: -300,
@@ -306,6 +307,7 @@ class Index extends React.Component {
             </div>
             <div className="column">
               <img
+                className="HomePageImage"
                 style={{ maxWidth: "200%", marginTop: -70, marginBottom: -70 }}
                 src="./img/homepage/native_and_js_mac_cropped.png"
                 alt="rnw_cropped"

website/static/css/homepage/HeaderHero.css

@@ -109,6 +109,14 @@
   padding: 10px;
 }
 
+@media only screen and (max-width: 600px) {
+  .column {
+    float: left;
+    width: 100%;
+    padding: 10px;
+  }
+}
+
 /* Create two equal columns that floats next to each other */
 .resourcesSideNavLinkColumn {
   float: left;

website/static/css/homepage/HomePage.css

@@ -3,3 +3,8 @@
   width: 100%;
   overflow-x: hidden;
 }
+@media only screen and (max-width: 600px) {
+  .HomePageImage {
+    display: none;
+  }
+}