docs: some work on moving over the reference docs

[orta]

I've started porting over the reference docs from the shiki-twoslash playground!

One tricky deprecation blocker so far, which is the auto-complete query doesn't work because it can't grab the character after the last one

console.e
//       ^|

=>

Error: [shikiji-twoslash] Cannot find token at L0:9
    at locateTextToken (file:///home/orta/dev/typescript/twoslashes/node_modules/.pnpm/shikiji-twoslash@0.10.0-beta.0/node_modules/shikiji-twoslash/dist/core.mjs:869:19)
    at Object.code (file:///home/orta/dev/typescript/twoslashes/node_modules/.pnpm/shikiji-twoslash@0.10.0-beta.0/node_modules/shikiji-twoslash/dist/core.mjs:897:25)

Which is kinda true, (there is no token!) but the auto-complete is only relevant after the text

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[antfu]

Oh I wasn't aware that use cases, added a test to guard it: 70f6d1c1f96e1abca5a0ab8ddae10052436d5b63

It seems the output of two slash is expected; I will handle it on the Shikiji side.

[antfu]

I actually fixed it already on the last Shikiji release :P, you may need to pnpm i to update them :)

[orta]

Nice