refactor: replace deno.land/std with jsr:@std

[crowlKats]

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TODO:

• [ ] update std/examples & testing examples
• [ ] deno.lock looks differently now

Usage of --eval-file flag are now broken (https://github.com/denoland/deno/issues/23071) and deployctl doesn't support jsr specifiers for entrypoint

[mattvr]

Oh whoops, just PRed almost the same thing and missed this: https://github.com/denoland/deno-docs/pull/587. Mine should be unblocked from landing as-is, but can change its scope or abandon if you prefer. @crowlKats

[thisisjofrank]

closig, fixed in other branches