NL UI: Improve place overview of continents/earth to show maps

[pradh]

A query like [show me about europe] leads to empty results.

How much new work is it to show a like we do on the disaster page:

[pradh]

@chejennifer for inputs

[pradh]

Ditto for earth:

[chejennifer]

To show default charts, it would be updating nl config generation to add all the wanted charts to the config instead of just a place overview tile. So shouldn't be too much work if we know what default charts we want to show