Refactor for Take 2

[NagariaHussain]

• Rename app
  • Manual rename on local and push
  • Rename the repo
• Remove Razorpay payment related code
  • Use https://github.com/BuildWithHussain/razorpay_frappe instead
• Refactor the frontend to render the pages at a configurable base route (/merch, etc.)
• Use Builder for FOSS United's store frontend (my recommendation, your call)

[mngshm]

I'll start working on this.