Update footer (#48)

Add more to community footer, change `More` to `Code` and add gitea.com, and remove `Docs` section that just linked back to home.

Reviewed-on: https://gitea.com/gitea/gitea-docusaurus/pulls/48
Co-authored-by: jolheiser <john.olheiser@gmail.com>
Co-committed-by: jolheiser <john.olheiser@gmail.com>

docusaurus.config.js

@@ -220,15 +220,6 @@ const config = {
       footer: {
         style: 'dark',
         links: [
-          {
-            title: 'Docs',
-            items: [
-              {
-                label: 'Tutorial',
-                to: '/',
-              },
-            ],
-          },
           {
             title: 'Community',
             items: [
@@ -240,19 +231,35 @@ const config = {
                 label: 'Discord',
                 href: 'https://discord.gg/gitea',
               },
+              {
+                label: 'Matrix',
+                href: 'https://matrix.to/#/#gitea-space:matrix.org',
+              },
+              {
+                label: 'Discourse',
+                href: 'https://discourse.gitea.io/',
+              },
               {
                 label: 'Twitter',
                 href: 'https://twitter.com/giteaio',
               },
+              {
+                label: 'Mastodon',
+                href: 'https://social.gitea.io/@gitea',
+              },
             ],
           },
           {
-            title: 'More',
+            title: 'Code',
             items: [
               {
-                label: 'Code',
+                label: 'GitHub',
                 href: 'https://github.com/go-gitea/gitea',
               },
+              {
+                label: 'Gitea',
+                href: 'https://gitea.com/gitea',
+              },
             ],
           },
         ],