Update navigation.yml

Author: ewakowalska

_data/navigation.yml

@@ -18,8 +18,8 @@
 #  link: "video"
 #- name: Schedule
 #  link: "schedule"
-#- name: Speakers
-#  link: "keynotes"
+- name: Speakers
+  link: "keynotes"
 #- name: Mentoring
 #  link: "mentoring"
 #- name: Trainers