Single binary for browsing

Some systems require a single binary for the BROWSER variable, and
rather than muck about with shell scripts we have this small thing
instead.

src/bin/fwd-browse.rs

@@ -0,0 +1,13 @@
+// TODO: An actual proper UI.
+
+#[tokio::main]
+async fn main() {
+    let args: Vec<String> = std::env::args().collect();
+
+    if args.len() < 2 {
+        eprintln!("Usage: fwd-browse <url>");
+        std::process::exit(1);
+    }
+
+    fwd::browse_url(&args[1]).await;
+}