social: use X logo instead of Twitter

* ordered the links
* sed s/twitter/x/

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

config.yaml

@@ -22,16 +22,15 @@ params:
   Email: hello@kinvolk.io
   Subtitle: Linux for containers
   social:
-    - title: twitter
-      url: 'https://twitter.com/flatcar'
-      image: 'twitter-icon'
     - title: bluesky
       url: 'https://bsky.app/profile/flatcar.bsky.social'
     - title: github
       url: 'https://github.com/flatcar'
       image: 'github-icon'
     - title: mastodon
       url: 'https://hachyderm.io/@flatcar'
+    - title: x-twitter
+      url: 'https://x.com/flatcar'
   favicon: "/media/brand-logo.svg"
   docs:
     github_edit_url: https://github.com/flatcar/flatcar-website/edit/master/content/docs/latest