A few tips to add to instructions

[xoredtwice]

Thank you so much for open-sourcing Aegis code. I had a few minor issues to test the project. Hope these tips would be helpful for the next person who wants to run Aegis:

1. npm run build:circuits did not work for me. Instead I used npm run build. Maybe because of npm version mismatch,
2. Install zsh before running npm run build.
3. On npx hardhat test I got an error about OwnerShip.r1cs file not found. After a closer look, I got that there are some typos in test/1_setup.test.js. To solve the issues, replace all "OwnerShip" to "Ownership" in test/1_setup.test.js.

Best.