Add database setup instructions

[jmcarp]

The docs should include or link to instructions for running the database locally--something like

• Install postgres
• Install postgis
• Create pupa database user
• Create opencivicdata db
• Run dbinit

Adding docker instructions would be neat too!

[jpmckinney]

I have very minimal instructions in another project which could be expanded into these docs: https://github.com/opencivicdata/scrapers-ca/#usage

[fgregg]

yeah, I have basically the same https://github.com/opencivicdata/scrapers-us-municipal#initialization

[jpmckinney]

@jmcarp On which page of the docs do you think it would make sense to add this content?

[jmcarp]

How about as a sibling to http://docs.opencivicdata.org/en/latest/scrape/run_scraper.html ? Then, instead of the oblique reference to the database ( if don’t have an opencivicdata postgres database set up ), that page can say something like:

To store scraped data in a database, run (link to database setup). Otherwise, if don’t have an opencivicdata postgres database set up, ...