Migrate to fontawesome 6

app/views/admin/events/_datatable_row.haml

@@ -69,4 +69,4 @@
       = link_to new_admin_conference_survey_path(@conference.short_title,
         survey: {  surveyable_type: 'Event', surveyable_id: event.id }),
         class: 'btn btn-success' do
-        .fa.fa-plus
+        .fa-solid.fa-plus

app/views/admin/events/index.html.haml

@@ -85,7 +85,7 @@
           %th
             %b State
           %th
-            .fa.fa-comment
+            .fa-solid.fa-comment
           %th Add Survey
         - @events.each do |event|
           = render 'datatable_row',

app/views/admin/events/registrations.html.haml

@@ -35,6 +35,6 @@
                 = check_box_tag @conference.short_title, @event.id, event_registration.attended, class: 'switch-checkbox', url: "#{toggle_attendance_admin_conference_program_event_path(@conference, @event, events_registration_id: event_registration)}&&event_registration[attended]="
               %td
                 - if event_registration.registration.attended
-                  %i.fa.fa-check.text-success
+                  %i.fa-solid.fa-check.text-success
                 - else
-                  %i.fa.fa-close.text-danger
+                  %i.fa-solid.fa-xmark.text-danger