Merge branch 'master' into 'production'

Master to prod

See merge request sahkoinsinoorikilta/vtmk/web2.0-frontend!111

src/pages/admin/signups/[id].tsx

@@ -110,7 +110,7 @@ const SignupCreatePage: NextPage = () => {
 
   useEffect(() => {
     const suId = id && Number(id);
-    if (suId !== undefined) {
+    if (suId !== undefined && !Number.isNaN(suId)) {
       SignupApi.getForm(suId, true)
         .then((res) => {
           setFormData({

src/views/FreshmenPage/FreshmenPageHero.tsx

@@ -19,7 +19,7 @@ const FreshmenPageHero: React.FC = () => (
 
       <HeroAsideItem
         header="Seuraa killan tiedotusta"
-        link="https://t.me/joinchat/rKg3rCtAVkkyNTdk"
+        link="https://t.me/+ubTeGSYKTvg3NmVk"
         linkText="Liity killan Telegram-ryhmiin"
       />
       <HeroAsideItem