Replace missing FA icons in interactive timeline.

`fa-duck` and `fa-alien-monster` (renamed `fa-alien-8bit` in the latest
FontAwesome) are part of the Pro plan, which we no longer have.

Author: kosayoda

pydis_site/templates/home/index.html

@@ -100,8 +100,8 @@ <h1 class="is-size-1">Who are we?</h1>
               <i class="fa fa-asterisk"></i>
               <i class="fa fa-code"></i>
               <i class="fab fa-python"></i>
-              <i class="fa fa-alien-monster"></i>
-              <i class="fa fa-duck"></i>
+              <i class="fab fa-discord"></i>
+              <i class="fa fa-terminal"></i>
               <i class="fa fa-bug"></i>
             </div>