Lga level json

Here I got the first step of the pipeline to json working, tested on nmis server, with a few concerns:
## concerns
1. "external data" missing:
    * on the lga overview page, the mdg1-7 are all NAs
2. still no water data
    * need separate water data from the old lga_aggregation
3. education data are all `NA`s
    * i checked the json and it should be there technically....
4. join(lgas)
    * i moved the join(lgas) into facility because the python script calls for the unique_lga, wonder if there's better way to write it
5. unicode
    * i had to turn ensure_ascii false due to unicode characters in our final json

## things that worked
1. facility level seems functional
    * yay!
2. Health lga aggregation working
    * yay!