Revert "alt text attribute for images"

This reverts commit 5a660551c6.

src/Explorer/Controls/NotebookGallery/InfoComponent/InfoComponent.tsx

@@ -1,5 +1,5 @@
-import { HoverCard, HoverCardType, Icon, Label, Link, Stack } from "@fluentui/react";
 import * as React from "react";
+import { Icon, Label, Stack, HoverCard, HoverCardType, Link } from "@fluentui/react";
 import { CodeOfConductEndpoints } from "../../../../Common/Constants";
 import "./InfoComponent.less";
 
@@ -41,7 +41,7 @@ export class InfoComponent extends React.Component<InfoComponentProps> {
   public render(): JSX.Element {
     return (
       <HoverCard plainCardProps={{ onRenderPlainCard: this.onHover }} instantOpenOnClick type={HoverCardType.plain}>
-        <div className="infoPanelMain" tabIndex={0}>
+        <div className="infoPanelMain">
           <Icon className="infoIconMain" iconName="Help" styles={{ root: { verticalAlign: "middle" } }} />
           <Label className="infoLabelMain">Help</Label>
         </div>

src/Explorer/Controls/NotebookGallery/InfoComponent/__snapshots__/InfoComponent.test.tsx.snap

@@ -12,7 +12,6 @@ exports[`InfoComponent renders 1`] = `
 >
   <div
     className="infoPanelMain"
-    tabIndex={0}
   >
     <Icon
       className="infoIconMain"

src/Explorer/SplashScreen/SplashScreen.tsx

@@ -9,7 +9,7 @@ import {
   Stack,
   TeachingBubble,
   TeachingBubbleContent,
-  Text
+  Text,
 } from "@fluentui/react";
 import { sendMessage } from "Common/MessageHandler";
 import { MessageTypes } from "Contracts/ExplorerContracts";
@@ -528,7 +528,7 @@ export class SplashScreen extends React.Component<SplashScreenProps> {
               >
                 {item.title}
               </Link>
-              <Image src={LinkIcon} alt=" " />
+              <Image src={LinkIcon} />
             </Stack>
             <Text>{item.description}</Text>
           </Stack>