chore: updated README to reflect the new project demo URL on jamesaworo.me

chore: configure production properties and add nixpacks.toml for deployment

update(web):resolve blockers and update product-category batch upload feature

update(mobile): add display network error on page load error for better user experience

update: receipt template to include unit-of-measure

update: add product unit-of-measure to quantity in payment receipt

update: change product category endpoint url suffix

update: chanage file-handler types in product-category usecase interface

update: add method handler for product category batch upload

update: use receipt prefix to concat receipt serial number

update: add receipt prefix in report-constant class

fix(product-upload): add a fix for product batch upload from excel sheet

update(login): update footer year

update (mobile-client): change initial url

fix: product batch uploading using excelsheet