Add repmgr home page to --help output

Per PostgreSQL commit 1933ae629e7b706c6c23673a381e778819db307d it seems
to be all the rage these days.

repmgr-action-cluster.c

@@ -1507,4 +1507,5 @@ do_cluster_help(void)
 	printf(_("    -k, --keep-history=VALUE  retain indicated number of days of history (default: 0)\n"));
 	puts("");
 
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-action-daemon.c

@@ -339,4 +339,5 @@ void do_daemon_help(void)
 
 	puts("");
 
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-action-node.c

@@ -3539,8 +3539,8 @@ do_node_help(void)
 	printf(_("    --list-actions            show what command would be performed for each action\n"));
 	printf(_("    --checkpoint              issue a CHECKPOINT before stopping or restarting the node\n"));
 	printf(_("    -S, --superuser=USERNAME  superuser to use, if repmgr user is not superuser\n"));
+
 	puts("");
 
-
-
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-action-primary.c

@@ -575,4 +575,5 @@ do_primary_help(void)
 
 	puts("");
 
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-action-service.c

@@ -543,4 +543,6 @@ void do_service_help(void)
 	puts("");
 
 	puts("");
+
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-action-standby.c

@@ -8849,4 +8849,7 @@ do_standby_help(void)
 	printf(_("  --siblings-follow                   have other standbys follow new primary\n"));
 
 	puts("");
+
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
+
 }

repmgr-action-witness.c

@@ -569,5 +569,5 @@ void do_witness_help(void)
 
 	puts("");
 
-	return;
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }

repmgr-client.c

@@ -2666,6 +2666,8 @@ do_help(void)
 	printf(_("  -v, --verbose                       display additional log output (useful for debugging)\n"));
 
 	puts("");
+
+	printf(_("%s home page: <%s>\n"), "repmgr", REPMGR_URL);
 }
 
 

repmgr.h

@@ -145,6 +145,6 @@
 #define TABLESPACE_MAP "tablespace_map"
 #endif
 
-
+#define REPMGR_URL "https://repmgr.org/"
 
 #endif							/* _REPMGR_H_ */