Move database into the main app

I was having issues including the lib as a crate, its fine just being a
module for now.

diesel.toml

@@ -0,0 +1,5 @@
+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/database/schema.rs"