chore: use dumi

[xrkffgg]

upload 的 demo 展示主要是看 console 的输出，目前 dumi 对这个还不支持，只能通过 F12 看。

想等等 这个 umijs/dumi#409

[vercel]

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[codecov]

Codecov Report

Merging #289 (0ac29cd) into master (5e48d5f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #289   +/-   ##
=======================================
  Coverage   73.96%   73.96%           
=======================================
  Files           6        6           
  Lines         242      242           
  Branches       58       58           
=======================================
  Hits          179      179           
  Misses         63       63           

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[xrkffgg]

先合了，console.log 后续再看。