cmd/clef, signer: refresh tutorial, fix noticed issues (#19774)

* cmd/clef, signer: refresh tutorial, fix noticed issues

* cmd/clef, signer: support removing stored keys (delpw + rules)

* cmd/clef: polishes + Geth integration in the tutorial

cmd/clef/pythonsigner.py

@@ -42,7 +42,6 @@ class PipeTransport(ServerTransport):
         self.output.write("\n")
 
 class StdIOHandler():
-
     def __init__(self):
         pass
 
@@ -76,7 +75,7 @@ class StdIOHandler():
         :param transaction: transaction info
         :param call_info: info abou the call, e.g. if ABI info could not be
         :param meta: metadata about the request, e.g. where the call comes from
-        :return: 
+        :return:
         """
         transaction = req.get('transaction')
         _from       = req.get('from')
@@ -158,8 +157,7 @@ class StdIOHandler():
         return
 
 def main(args):
-
-    cmd = ["./clef", "--stdio-ui"]
+    cmd = ["clef", "--stdio-ui"]
     if len(args) > 0 and args[0] == "test":
         cmd.extend(["--stdio-ui-test"])
     print("cmd: {}".format(" ".join(cmd)))