Remove old arena aliases without the prefix

example/arena.c

@@ -9,14 +9,14 @@ typedef struct {
 
 int main(void)
 {
-    Arena arena = gebs_arena_get();
+    Arena arena = arena_get();
     defer { arena_destroy(&arena); }
 
     Ints ints = {0};
     for (size_t i = 0; i < 10000; i++) {
         list_append_alloc(&arena, &ints, i);
     }
-    gebs_arena_reset(&arena);
+    arena_reset(&arena);
 
     printf("%s\n", fmt("Hello formatting %d", 124));