Move json data to the DB

[karlcow]

I want to try to import the JSON data into the DB. This needs an import script.

[laghee]

All the data that needs to move:

• [x] needsdiagnosis count
• [x] needstriage count
• [x] sitewait count
• [x] needscontact count
• [x] weekly reports

[laghee]

All data for the first four categories has been shifted to the database [including any available data from before the scripts started running as well as the missing data we missed by disabling the scripts with PR #108 (fixed in PR #112)].

Adding the weekly reports data is in progress:

• [x] Add third table to DB, models.py — weekly_total
• [x] Add weekly script to query daily_total and insert into weekly_total

Notes to self:

• Script should run every Monday, well after daily script has completed — maybe 4am?)
• Script should sum totals of previous Monday through Sunday (yesterday) and add the resulting weekly total to DB with PREVIOUS Monday's timestamp (e.g., the weekly total for June 17-23 should be timestamped 2019-06-17)