fix: custom docs ordering

[manuel3108]

Fixes #250

removes the sorting by title, as this would place the cli before kit and svelte.
slightly changes the name of our "packages" to include ordering, as we do on a lot of docs related places.

to be done: sync the docs (didn't find the branches you were using, so always got slightly modified results)

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[Rich-Harris]

if we're removing the .sort elsewhere, do we need this change?

[manuel3108]

Yes, because they are ordered the same way the filesystem does, so still alphabetically

[Rich-Harris]

Ah. I think the disconnect here is that I was envisaging we'd just hardcode the order in the dropdown. It seems likely that we're eventually going to want to have separators (or maybe subheads) etc...

...and it would be cumbersome to express that in the filesystem. The current solution using nav.json was originally built to serve multiple sites and as such is hopelessly overengineered, and I think we should just get rid of it rather than accommodating it.

[manuel3108]

Sure, then I'll just leave that up to you, you are way more aware of the codebase