use current directory as default logging socket path

_docs/debug.md

@@ -8,7 +8,7 @@ CTOP_DEBUG=1 ./ctop
 
 While `ctop` is running, you can connect to the logging socket via socat or similar tools:
 ```bash
-socat unix-connect:/tmp/ctop.sock stdio
+socat unix-connect:./ctop.sock stdio
 ```
 
 example output:

logging/server.go

@@ -7,7 +7,7 @@ import (
 )
 
 const (
-	path = "/tmp/ctop.sock"
+	path = "./ctop.sock"
 )
 
 var server struct {