Marking "coming soon" data in the portal.

[emmetaobrien]

We have several recent or incoming datasets which contain descriptions but not currently any data, and it has been proposed that we should flag these in some way in the portal.

My suggestion here is

1. add an optional field to DATS.json under extraProperties, called comingSoon, containing a short description of the dataset status (not just a simple yes/no flag, a string would allow us to include e.g. an expected date if we have one)
2. modify the portal to check for the existence of this field:
   IF there is no comingSoon value THEN proceed exactly as before
   IF there is a comingSoon value THEN display that (and possibly adjust other aspects of the card to make this visually clearer - remove some elements, or use lighter colours for a "faded" effect to suggest that the dataset is not currently active? Design input sought here.)

[emmetaobrien]

Decided to add test values of comingSoon to the CCNA and C-OPN datasets, in order to have something to pick up in the portal code.