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5b2e7e2f - docs: restructure and update "Deno 1.x to 2.x Migration Guide" (#776)

docs: restructure and update "Deno 1.x to 2.x Migration Guide" (#776) Co-authored-by: Marvin Hagemeister <marvin@deno.com> Co-authored-by: Jo Franchetti <jofranchetti@gmail.com>