replace gitter with discord invitation link on Home tab

apps/remix-ide/src/app/tabs/locales/en/home.json

@@ -45,7 +45,7 @@
   "home.remixTwitterProfile": "Remix Twitter Profile",
   "home.remixLinkedinProfile": "Remix Linkedin Profile",
   "home.remixMediumPosts": "Remix Medium Posts",
-  "home.remixGitterChannel": "Remix Gitter Channel",
+  "home.remixGitterChannel": "Join us on Discord",
   "home.nativeIDE": "The Native IDE for Web3 Development.",
   "home.website": "Website",
   "home.documentation": "Documentation",

apps/remix-ide/src/app/tabs/locales/zh/home.json

@@ -43,7 +43,7 @@
   "home.remixTwitterProfile": "Remix 推特档案",
   "home.remixLinkedinProfile": "Remix 领英档案",
   "home.remixMediumPosts": "Remix Medium 文章",
-  "home.remixGitterChannel": "Remix Gitter 频道",
+  "home.remixGitterChannel": "Join us on Discord",
   "home.nativeIDE": "用于 Web3 开发的原生 IDE。",
   "home.website": "网站",
   "home.documentation": "文档",

libs/remix-ui/home-tab/src/lib/components/homeTabTitle.tsx

@@ -142,10 +142,10 @@ function HomeTabTitle() {
           >
             <button
               onClick={() => {
-                openLink("https://gitter.im/ethereum/remix")
-                _paq.push(['trackEvent', 'hometab', 'socialmedia', 'gitter'])
+                openLink("https://discord.gg/mh9hFCKkEq")
+                _paq.push(['trackEvent', 'hometab', 'socialmedia', 'discord'])
               }}
-              className="border-0 h-100 p-2 btn fab fa-gitter">
+              className="border-0 h-100 p-2 btn fab fa-discord">
             </button>
           </CustomTooltip>
         </span>