[TASK] Revamp the validator onboarding

[1xstj]

The goal here is to reduce the time/steps from a clean slate to a running validator, the proposal is to refactor the flow like below

-> Validators
  --> Quick Setup
  --> Advanced Setup
     --> Docker
     --> SystemD
     --> Optional Flags

Quick Setup
This would ideally be two steps only, get image/binary and run command, everything should be prefilled and anyone should be able to get it running by copy/paste. Should come with warning that this is unsafe and not meant for long term.

Advanced Setup
This would be our current flow, mentioning all the possible flags and options, meant for more long-term validator setup.