Add options when creating a new page

[Cahllagerfeld]

When creating a new page we should add a select with the following options (allowing multi-select)

• +page.svelte
• +page.ts
• +page.server.ts

[mikenikles]

We could probably combine this with #276 as per comment here.

[Cahllagerfeld]

Maybe even #257 is in the scope of it. What do you think?

[mikenikles]

Yes, let's combine them all. We may as well since all three touch similar / the same areas of the code.

[Cahllagerfeld]

After reviewing the required changes, I'd be in favor of keeping #257 separate to remove complexity