Make Postgres default since SQLite doesn't work anymore

.gitignore

@@ -14,7 +14,6 @@
 # Ignore all logfiles and tempfiles.
 /log/*.log
 /tmp
-/config/database.yml
 /config/secrets.yml
 /db/schema.rb
 /erd.pdf

config/database.yml.example

@@ -1,25 +0,0 @@
-# SQLite version 3.x
-#   gem install sqlite3
-#
-#   Ensure the SQLite 3 gem is defined in your Gemfile
-#   gem 'sqlite3'
-#
-default: &default
-  adapter: sqlite3
-  pool: 5
-  timeout: 5000
-
-development:
-  <<: *default
-  database: db/development.sqlite3
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
-test:
-  <<: *default
-  database: db/test.sqlite3
-
-production:
-  <<: *default
-  database: db/production.sqlite3