feat: add default rate_limiting option

src/config.rs

@@ -32,6 +32,7 @@ pub struct MastodonConfig {
 pub struct ScootalooConfig {
     pub db_path: String,
     pub cache_path: String,
+    pub rate_limit: Option<usize>,
 }
 
 /// Parses the TOML file into a Config Struct