Update default certificate of Github (#1322)

So as to enable updates with a payload without the cert, and add a command example. Also so change the update message to notice level

main/User_config.h

@@ -207,27 +207,26 @@ const char* certificate PROGMEM = R"EOF("
 // The default certificate is for github.
 const char* OTAserver_cert PROGMEM = R"EOF("
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
 ")EOF";