Improvements for --base-path usage (#292)

* Trim trailing slashes in --base-path option

* Redirect `/base-path` to `/base-path/`

* Log endpoints if --base-path is provided

* Use predefined token for standard header 'location'

src/server.h

@@ -18,6 +18,7 @@ struct endpoints {
   char *ws;
   char *index;
   char *token;
+  char *parent;
 };
 
 extern volatile bool force_exit;