index.html: Use "Data" instead of "Data Portal" for the first block
index.html: Use "Data" instead of "Data Portal" for the first block

We use "data" all over, and "Tools" is generic, so this is more
consistent.

Signed-off-by: Alan Orth <1ad53e5ac412470be257046982dc9c04920057fa@cgiar.org>

alanorth/data.ilri.org,alanorth/data.ilri.org