added settings API + fixed bug (#62)

* added settings API + fixed bug

* removed redundant API funcs

* comment clarifications

---------

Co-authored-by: Wyatt <wyatt@modrinth.com>

theseus_playground/src/main.rs

@@ -87,7 +87,7 @@ async fn main() -> theseus::Result<()> {
     // Attempt to get the default user, if it exists, and refresh their credentials
     let default_user_uuid = {
         let settings = st.settings.read().await;
-        settings.default_user.clone()    
+        settings.default_user
     };
     let credentials = if let Some(uuid) = default_user_uuid {
         println!("Attempting to refresh existing authentication.");