add RPostgreSQL as dependency
Start shiny app

Add minimal shiny app to show graph.

Start shiny app in web dyno.
Bind to 0.0.0.0

Bind to 0.0.0.0 so Heroku can route requests to shiny.
Fix running on headless server

Fix running on heroku by removing dependency on X11 for rendering PNGs.
Simplify UI

Only show chart
Parse database credentials from DATABASE_URL variable
Load .env only if it exists
Pull user's name from database
Set up Deploy to Heroku