Nested routes with parent route ending with `/*` will nest after the `/*`.

### Description

The fact that both `/about` and `/about/*` appear to do the same thing could be confusing. I think we should only support one of them.

```imba
tag app

'Home'

Start by reproducing the nested-route example from issue #790 and inspect the routing implementation that handles parent paths ending in `/*`. Determine the intended behavior for `/about` versus `/about/*`, then add coverage showing that nested routes resolve consistently under the chosen form.

Written by the indexing model from the issue text.