Remove "I AM NOT DONE" and the verify mode and add AppState

exercises/05_vecs/vecs1.rs

@@ -7,8 +7,6 @@
 //
 // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     let a = [10, 20, 30, 40]; // a plain array
     let v = // TODO: declare your vector here with the macro for vectors

exercises/05_vecs/vecs2.rs

@@ -7,8 +7,6 @@
 //
 // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
     for element in v.iter_mut() {
         // TODO: Fill this up so that each element in the Vec `v` is