Ignore group routes

[astrojarred]

As per SvelteKit's advanced routing, directories can be contained in parenthesis (e.g. /src/routes/(group)/...) to separate groups of pages with different layouts.

These should be detected and:

• if the +server.py is directly within a top-level /src/routes/(*) folder, this should be treated as the index / route.
• if the +server.py is anywhere else underneath a any number of () pages, simply remove the entire section from the API endpoint URL and directory structure.

This follows the logic in the documentation linked above.

e.g.

src/routes/
│ (app)/
│ ├ +page.svelte   ---> API endpoint should be: `/api`
│ ├ item/
│ └ +layout.svelte
│ └ +page.svelte
│ └ +server.py     ---> API endpoint should be: `/api/item`