refactor: misc clippy suggestions

src/main.rs

@@ -10,7 +10,7 @@ use std::thread;
 use console_subscriber::ConsoleLayer;
 
 /// Return a requested DB name from command line arguments.
-fn db_from_args(args: Vec<String>) -> Option<String> {
+fn db_from_args(args: &[String]) -> Option<String> {
     if args.len() == 3 && args.get(1) == Some(&"--db".to_owned()) {
         return args.get(2).map(std::clone::Clone::clone);
     }
@@ -25,7 +25,7 @@ fn main() {
 
     // get database directory from args
     let args: Vec<String> = env::args().collect();
-    let db_dir: Option<String> = db_from_args(args);
+    let db_dir: Option<String> = db_from_args(&args);
     // configure settings from config.toml
     // replace default settings with those read from config.toml
     let mut settings = config::Settings::new();
@@ -44,7 +44,7 @@ fn main() {
     let handle = thread::spawn(|| {
         // we should have a 'control plane' channel to monitor and bump the server.
         // this will let us do stuff like clear the database, shutdown, etc.
-        let _ = start_server(settings, ctrl_rx);
+        let _svr = start_server(settings, ctrl_rx);
     });
     // block on nostr thread to finish.
     handle.join().unwrap();