[PR]: Added content

[britsanto]

• Changed 'Tools' format (moved existing tabs under MINIMOD)
• Added publications
• Added links to list in publications
• Changed name of 'Event' tabs
• Removed a contact from 'Directory'
• Added biofortification and vitamin A pictures to picture folder

[amichuda]

fixed mkdocs.yml conflict.

By the way, the structure of the focus countries list in the yaml file you had was actually correct, I changed it back to that. Great job on this PR!