fix(docs): Update slack logo

docs/layouts/partials/footer.html

@@ -3,11 +3,40 @@
         <div class="flex justify-between">
             <div class="links">
                 <ul>
-                    <li><a href="https://github.com/vendure-ecommerce/vendure"><img class="link-icon" alt="GitHub logo" src="/svg/icon-github-inverse.svg"> GitHub</a></li>
-                    <li><a href="https://www.npmjs.com/~vendure"><img class="link-icon" alt="npm logo" src="/svg/icon-npm.svg"> npm</a></li>
-                    <li><a href="https://twitter.com/vendure_io"><img class="link-icon" alt="Twitter logo" src="/svg/icon-twitter.svg"> Twitter</a></li>
-                    <li><a href="https://join.slack.com/t/vendure-ecommerce/shared_invite/enQtNzA1NTcyMDY3NTg0LTMzZGQzNDczOWJiMTU2YjAyNWJlMzdmZGE3ZDY5Y2RjMGYxZWNlYTI4NmU4Y2Q1MDNlYzE4MzQ5ODcyYTdmMGU"><img class="link-icon" alt="Slack logo" src="/svg/icon-slack.svg"> Join us on Slack</a></li>
-                    <li><a href="mailto:[email protected]" class="email-link"><img src="/svg/clr-icon-email-light.svg" class="link-icon" alt="email icon"> [email protected]</a></li>
+                    <li>
+                        <a href="https://github.com/vendure-ecommerce/vendure"
+                            ><img class="link-icon" alt="GitHub logo" src="/svg/icon-github-inverse.svg" />
+                            GitHub</a
+                        >
+                    </li>
+                    <li>
+                        <a href="https://www.npmjs.com/~vendure"
+                            ><img class="link-icon" alt="npm logo" src="/svg/icon-npm.svg" /> npm</a
+                        >
+                    </li>
+                    <li>
+                        <a href="https://twitter.com/vendure_io"
+                            ><img class="link-icon" alt="Twitter logo" src="/svg/icon-twitter.svg" />
+                            Twitter</a
+                        >
+                    </li>
+                    <li>
+                        <a
+                            href="https://join.slack.com/t/vendure-ecommerce/shared_invite/enQtNzA1NTcyMDY3NTg0LTMzZGQzNDczOWJiMTU2YjAyNWJlMzdmZGE3ZDY5Y2RjMGYxZWNlYTI4NmU4Y2Q1MDNlYzE4MzQ5ODcyYTdmMGU"
+                            ><img
+                                class="link-icon"
+                                alt="Slack logo"
+                                src="/logo/slack-logo-icon-127x127.png"
+                            />
+                            Join us on Slack</a
+                        >
+                    </li>
+                    <li>
+                        <a href="mailto:[email protected]" class="email-link"
+                            ><img src="/svg/clr-icon-email-light.svg" class="link-icon" alt="email icon" />
+                            [email protected]</a
+                        >
+                    </li>
                 </ul>
             </div>
             <div class="footer-logo">