Splaspage: Add highlights. Fix cfp inclusion.

app/views/conference/_program.html.haml

@@ -24,9 +24,22 @@
           = link_to(conference_schedule_path(@conference.short_title), class: 'btn btn-default btn-lg') do
             Full Schedule
 
-  - #FIXME: Display keynotes https://github.com/openSUSE/osem/issues/544 
-  - #FIXME: Display schedule highlights https://github.com/openSUSE/osem/issues/545
+  - #FIXME: Display keynotes https://github.com/openSUSE/osem/issues/544
 
+  %h3.text-center
+    Don't miss out!
+  - if @conference.highlights.any?
+    .row
+      .col-md-12
+        - @conference.highlights.each_slice(2) do |slice|
+          .row.row-centered
+            - slice.each do |event|
+              .col-md-6.col-centered.col-top.highlights
+                %p.text-center
+                  %b= event.title
+                %h5.text-center
+                  = simple_format truncate(event.abstract, length: 500, separator: ' ')
+                  = link_to "Read More", conference_proposal_path(@conference.short_title, event)
 
   = content_for :splash_nav do
     %li