* cmd/puppeth: integrate blockscout
* cmd/puppeth: expose debug namespace for blockscout
* cmd/puppeth: fix dbdir
* cmd/puppeth: run explorer in archive mode
* cmd/puppeth: ensure node is synced
* cmd/puppeth: fix explorer docker alignment + drop unneeded exec
* cmd/puppeth: polish up config saving and reloading
* cmd/puppeth: check both web and p2p port for explorer service