Support onboarding & Drop faucet (#119)

* Renaming

* Add server-side support for onboarding

* add onboard --amount command

* support client side onboarding

* Drop dummy tx builder

* Drop faucet

* Fixes

* fix public key encoding

* fix schnorr pub key check in validation

* fix server/README to accomodate onboarding

---------

Co-authored-by: Louis <louis@vulpem.com>
Co-authored-by: João Bordalo <bordalix@users.noreply.github.com>

client/redeem.go

@@ -38,7 +38,7 @@ var (
 
 var redeemCommand = cli.Command{
 	Name:   "redeem",
-	Usage:  "Redeem VTXO(s) to onchain",
+	Usage:  "Redeem your offchain funds, either collaboratively or unilaterally",
 	Flags:  []cli.Flag{&addressFlag, &amountToRedeemFlag, &forceFlag},
 	Action: redeemAction,
 }