feat: minor refactor to clarify configs with env + initial thoughs on truth source model

src/modules/source/mod.rs

@@ -0,0 +1,11 @@
+pub struct Database {
+    path: String,
+}
+
+// TruthSource
+pub trait WordSource {
+    fn find_word(&self, word: &str) -> Result<(), ()>;
+    fn insert_word(&self, word: &str) -> Result<(), ()>;
+    fn remove_word(&self, word: &str) -> Result<(), ()>;
+    fn get_all_words(&self) -> Vec<String>;
+}