modules, homestakeros: add 'port' and 'jsonRpcPort' options

[tupakkatapa]

it is what it is

[jhvst]

I'm bit hesitant on merging this before the demo, does this require changes on the frontend?

[tupakkatapa]

This can be left hanging and merged some other time, just threw this here on a whim since i saw the comment on the SSV node section.

HomestakerOS/nixosModules/homestakeros/default.nix

Lines 230 to 231 in 060690f

	# This assumes that the websocket is bind to the same port, true for erigon, not for others
	# TODO: Consider having a variable name for websocket endpoint

This does not require changes from the frontend, neither it does not play any role in the demo.