Installing with go install <package> fails

[canercidam]

go install . works but currently having a problem when the remote path and version is specified:

$ go get github.com/flashbots/builder-playground@v0.3.0
go: downloading github.com/flashbots/builder-playground v0.3.0
go: github.com/flashbots/builder-playground@v0.3.0 (in github.com/flashbots/builder-playground@v0.3.0):
	The go.mod file for the module providing named packages contains one or
	more replace directives. It must not contain directives that would cause
	it to be interpreted differently than if it were the main module.

We might need to depend directly on op-geth.