feat: fix forge-std lib and update readme

[0xValJohn]

• Update forge-std module to master (was causing test issues on fresh install)
• Add Node.js in readme requirements
• Improve environment variables section in readme

[Schlagonia]

• can you update the installed forg-std dependency too. Not just to submodule file. That way if people directly fork it will be the correct dependency
• The etherscan API key is not ever actually used. One thing i keep meaning to do is remove it all togethor. Can you delete all reference to ETHERSCAN_API_KEY including the env example, the Make file and the read me?

[0xValJohn]

@Schlagonia added in 0d45168 , for your review please

[Schlagonia]

just merged a PR on the periphery repo. Since this is already open. Can you also just update the periphery dependency to the latest commit on the master branch.

Should just be an update to BaseHealthCheck. commit: bbc3a0354f45dab087a4c82650e42225433c8fef

[0xValJohn]

periphery lib updated