add "Feature request" link to footer (#1094)

Fixes #1091

icons/social/canny.svg

+<svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" clip-rule="evenodd" d="M17.283 14.602a1.13 1.13 0 0 1 1.231-1.024c.62.057 1.081.608 1.024 1.231a7.455 7.455 0 0 1-7.465 6.79c-4.143 0-7.513-3.357-7.513-7.482V9.883c0-4.126 3.37-7.483 7.513-7.483 3.84 0 7.125 2.981 7.48 6.79a1.132 1.132 0 1 1-2.255.208c-.247-2.653-2.542-4.734-5.225-4.734-2.89 0-5.245 2.343-5.245 5.219v4.234c0 2.879 2.351 5.218 5.245 5.218 2.677 0 4.966-2.077 5.21-4.733ZM8.763 9a3.447 3.447 0 0 1 3.32-2.55c1.562 0 2.93 1.05 3.32 2.559a1.135 1.135 0 0 1-.81 1.382 1.135 1.135 0 0 1-1.382-.81 1.165 1.165 0 0 0-1.132-.867c-.527 0-.99.358-1.129.873a1.133 1.133 0 0 1-1.385.8 1.132 1.132 0 0 1-.801-1.387Z" fill="currentColor"/>
+</svg>

ui/snippets/footer/Footer.tsx

@@ -7,6 +7,7 @@ import type { CustomLinksGroup } from 'types/footerLinks';
 import config from 'configs/app';
 import discussionsIcon from 'icons/discussions.svg';
 import editIcon from 'icons/edit.svg';
+import cannyIcon from 'icons/social/canny.svg';
 import discordIcon from 'icons/social/discord.svg';
 import gitIcon from 'icons/social/git.svg';
 import twitterIcon from 'icons/social/tweet.svg';
@@ -41,6 +42,12 @@ const Footer = () => {
       text: 'Submit an issue',
       url: issueUrl,
     },
+    {
+      icon: cannyIcon,
+      iconSize: '20px',
+      text: 'Feature request',
+      url: 'https://blockscout.canny.io/feature-requests',
+    },
     {
       icon: gitIcon,
       iconSize: '18px',