test: add tests for scootaloo alt services + regexp

src/config.rs

@@ -36,6 +36,8 @@ pub struct ScootalooConfig {
     pub db_path: String,
     pub cache_path: String,
     pub rate_limit: Option<usize>,
+    pub show_url_as_display_url_for: Option<String>,
+    pub alternative_services_for: Option<HashMap<String, String>>,
 }
 
 /// Parses the TOML file into a Config Struct