Add docker-compose file, for postgres

Remove debug function to seed db with test product data

Add db migration for test product seeding

Fix index page link in template

Update README.md

Add 'undo' button when an item is removed from cart

Update templates to use id instead of product_id

Rename ProductView product_id to id

Remove unused references

Update templates to use new price type

Use custom price type

Add price struct, stores price in cents and handles math/formatting

Remove crate bigdecimal

Add sorting by newest/oldest products

add 'added date' and 'expected restock date' fields to product table