Update footer text

README.md

@@ -11,4 +11,4 @@ For more information: [Shinigami Eyes website](https://shinigami-eyes.github.io/
 
 ![Screenshot](https://raw.githubusercontent.com/shinigami-eyes/shinigami-eyes/master/images/preview.png)
 
-Follow us on [Twitter](https://www.twitter.com/ShinigamiEyesT) or [Facebook](https://www.facebook.com/ShinigamiEyesT)
+Follow us on Twitter: [@ShinigamiEyesT](https://www.twitter.com/ShinigamiEyesT)

extension/help.html

@@ -290,7 +290,7 @@
         </section>
 
         <section class="section-footer">
-            Don't forget to follow us on <a href="https://twitter.com/ShinigamiEyesT" target="_blank">Twitter</a> or <a href="https://www.facebook.com/ShinigamiEyesT" target="_blank">Facebook</a>!<br><a href="https://shinigami-eyes.github.io/privacy-policy" target="_blank">Privacy</a>
+            Follow us on <a href="https://twitter.com/ShinigamiEyesT" target="_blank">Twitter</a><br><a href="https://shinigami-eyes.github.io/privacy-policy" target="_blank">Privacy</a>
         </section>
 
     </div>

extension/options.html

@@ -86,7 +86,7 @@
 
 
         <section class="section-footer">
-            Don't forget to follow us on <a href="https://twitter.com/ShinigamiEyesT" target="_blank">Twitter</a> or <a href="https://www.facebook.com/ShinigamiEyesT" target="_blank">Facebook</a>!<br><a href="https://shinigami-eyes.github.io/privacy-policy" target="_blank">Privacy</a>
+            Follow us on <a href="https://twitter.com/ShinigamiEyesT" target="_blank">Twitter</a><br><a href="https://shinigami-eyes.github.io/privacy-policy" target="_blank">Privacy</a>
         </section>
 
     </div>