Add /// file annotations

[Rich-Harris]

This makes the exercises a bit easier to understand and navigate. TODO:

• when clicking an annotation for a file that doesn't yet exist, trigger the add action
• add inline annotations for all files, not just those that exist at the start of the exercise. give them the same behaviour as the code block annotations
• make missing annotations an error, to prevent regressions
• create a /// no-file annotation so that we can explicitly opt out
• on mobile, clicking an annotation should switch over to the editor view and cause a history.pushState. we probably need a ?file=blah query param (maybe this replaces ?view=editor rather than augmenting?)

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Name	Status	Preview	Comments	Updated
learn-svelte-dev	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 21, 2023 at 9:38PM (UTC)