docs: remove goerli and add holesky addresses to README (#511)

**Motivation:**

Updating the `README.md` to add our holesky contract addresses and
removing goerli addresses to prepare for network deprecation.

**Modifications:**

Added the holesky contract addresses to the deployment section and
removing the goerli addresses.

**Result:**

Users will be able to find our Holesky contract addresses.

Author: AustinGreen