add configuration value to drop default keybindings

resolves #204

src/config.rs

@@ -9,6 +9,7 @@ pub const CLIENT_ID: &str = "d420a117a32841c2b3474932e49fb54b";
 
 #[derive(Clone, Serialize, Deserialize, Debug, Default)]
 pub struct Config {
+    pub default_keybindings: Option<bool>,
     pub keybindings: Option<HashMap<String, String>>,
     pub theme: Option<ConfigTheme>,
     pub use_nerdfont: Option<bool>,