feat: full_quests_path

- Added Config::full_quests_path
- Fixed quests saving in parent folder

src/quest/mod.rs

@@ -154,7 +154,8 @@ impl Quest {
     /// ```
     pub fn save(&self, path: PathBuf) -> Result<(), QuestError> {
         let filename = format!("{}.toml", self.id);
-        let full_path = path.with_file_name(filename);
+        let mut full_path = path;
+        full_path.push(filename);
         
         let str = match toml::to_string_pretty(&self) {
             Ok(string) => string,