docs: upgrade nextra to v2

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Latest commit: d9bcb9e

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Name	Status	Preview	Updated
edge-runtime	✅ Ready (Inspect)	Visit Preview	Dec 15, 2022 at 2:51PM (UTC)

[codecov-commenter]

Codecov Report

Merging #220 (819abde) into main (345cdf1) will not change coverage.
The diff coverage is n/a.

❗ Current head 819abde differs from pull request most recent head 08dec5a. Consider uploading reports for the commit 08dec5a to get more accurate results

@@           Coverage Diff           @@
##             main     #220   +/-   ##
=======================================
  Coverage   80.50%   80.50%           
=======================================
  Files          24       24           
  Lines        1985     1985           
  Branches      157      157           
=======================================
  Hits         1598     1598           
  Misses        368      368           
  Partials       19       19           

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