Changes to FITS API page in Data Menu

[mabznz]

[ ] - Menu title to be renamed from 'FITS' to 'FITS API'
[ ] - On FITS API home page, address link for 'GNSS Daily Time Series' to change to new map tab of Geodetic page.

@elidana @rumachan Suggest we keep the rest of these pages the same for now until we get feedback from all the work we are about to do.