Migrate to fontawesome 6

app/views/proposals/registrations.html.haml

@@ -34,11 +34,11 @@
                 %td= event_registration.created_at
                 %td.text-center
                   - if event_registration.attended
-                    %i.fa.fa-check.text-success
+                    %i.fa-solid.fa-check.text-success
                   - else
-                    %i.fa.fa-times.text-danger
+                    %i.fa-solid.fa-xmark.text-danger
                 %td
                   - if event_registration.registration.attended
-                    %i.fa.fa-check.text-success
+                    %i.fa-solid.fa-check.text-success
                   -else
-                    %i.fa.fa-times.text-danger
+                    %i.fa-solid.fa-xmark.text-danger

app/views/proposals/show.html.haml

@@ -40,7 +40,7 @@
                   %br
                   - if speaker.email_public?
                     = mail_to "#{ speaker.email }" do
-                      %i.fa.fa-envelope-o.fa-2x
+                      %i.fa-solid.fa-envelope.fa-2x
                 - if speaker.affiliation?
                   .text-muted
                     from