fix: config to file and import optimize

does not need to be module

pkgr/src/config/mod.rs

@@ -1,30 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-#[derive(Debug, Serialize, Deserialize)]
-pub struct Config {
-    #[serde(default)]
-    pub build_by_default: bool,
-    #[serde(default)]
-    pub tmp_dir: Option<String>,
-}
-
-impl Default for Config {
-    fn default() -> Config {
-        Config {
-            build_by_default: false,
-            tmp_dir: Some(String::from("/tmp/pkgr"))
-        }
-    }
-}
-
-impl Config {
-    pub fn from_path(path: &str) -> Result<Config, String> {
-        match std::fs::read_to_string(path) {
-            Ok(s) => match toml::from_str(&s) {
-                Ok(c) => Ok(c),
-                Err(e) => Err(format!("failed to parse config: {}", e)),
-            },
-            Err(e) => Err(format!("failed to read config: {}", e)),
-        }
-    }
-}