#451 - related changes needed for #485
fixes #451 - add dropdown About menu with all the links
fixes #451 - add script to redirect on the right tab, based on the location hashtag
#451 - related changes needed for #485
         - for old header
#451 - related changes needed for #485
         - forgot about about link
fixes #451 - add dropdown About menu with all the links
                  - old header
Merge pull request #505 from OCHA-DAP/arti-sprint-17

Arti sprint 17