FIX: binary name should be tsk, follow defaults to idx 1

Cargo.toml

···
 readme = "readme"
 authors = ["Noah Pederson <[e-mail]>"]
 
+[[bin]]
+name = "tsk"
+path = "src/main.rs"
+
 [dependencies]
 clap = { version = "4", features = ["derive", "env"] }
 clap_complete = "4"

src/main.rs

···
     /// address the link. That number should be supplied to the -l/link_index where it will be
     /// subsequently followed opened or shown.
     Follow {
-        /// The index of the link to open. Must be supplied.
-        #[arg(short = 'l')]
-        link_index: usize,
         /// The task whose body will be searched for links.
         #[command(flatten)]
         task_id: TaskId,
+        /// The index of the link to open. Must be supplied.
+        #[arg(short = 'l', default_value_t = 1)]
+        link_index: usize,
         /// When opening an internal link, whether to show or edit the addressed task.
         #[arg(short = 'e', default_value_t = false)]
         edit: bool,