Dev Dependencies manual installation doesn't work out of the box

[tedim52]

Where did you see the issue in our documentation?

README.md

Issue description

Currently the dev dependency installation process is broken.

1. There should be separate guides for Mac OS and Linux, right now they're combined.
2. Golangci-lint needs to be added to installation steps
3. EM Server uses go 1.21 whereas others use 1.20 which causes the following issue:

go: github.com/kurtosis-tech/kurtosis/engine/server/engine imports
	github.com/kurtosis-tech/kurtosis/core/launcher/api_container_launcher imports
	github.com/kurtosis-tech/kurtosis/kurtosis_version: module github.com/kurtosis-tech/kurtosis/kurtosis_version@latest found (v0.0.0-20240701132718-b9e2427ceafa, replaced by ../../kurtosis_version), but does not contain package github.com/kurtosis-tech/kurtosis/kurtosis_version
/root/kurtosis/cloud/api/golang
/root/kurtosis/grpc-file-transfer/golang
go: module ../../enclave-manager/server listed in go.work file requires go >= 1.21, but go.work lists go 1.20; to update it:
	go work use
Error: Go generate failed
Error: An error occurred building the CLI
Error: Build script '/root/kurtosis/cli/scripts/build.sh' failed