Bulma Mega Menu Extension (#1083)

* Update extensions.html

Added Bulma Mega Menu extension details.

* Add files via upload

Added bulma-megamenu extension image.

* Update extensions.html

Updated the dimensions of the image.

* Update extensions.html

Added Cool Checkboxes Extension

* Add files via upload

Added Bulma Cool Checkboxes image.

docs/extensions.html

@@ -63,6 +63,16 @@ extensions:
   slug: bulma-timeline
   width: 401
   height: 352
+- name: bulma-megamenu
+  url: https://github.com/hunzaboy/bulma-megamenu
+  slug: bulma-megamenu
+  width: 668
+  height: 182
+- name: bulma-coolcheckboxes
+  url: https://github.com/hunzaboy/Cool-Checkboxes-for-Bulma.io
+  slug: bulma-coolcheckbox
+  width: 450
+  height: 184
 - name: bulma.io-axure
   url: https://github.com/Code-Mine-Development/Bulma.io-axure
   slug: bulma.io-axure