Darken the section title on the management dashboard
Darken the section title on the management dashboard

* Darken the color of h3 elements to #66666
* Set the color of the border to #cccccc

https://seedscientific.atlassian.net/browse/POLIO-689

unicef/rhizome,unicef/polio,unicef/polio,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,unicef/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,SeedScientific/polio