docs: trying to fix i18n

[tw0517tw]

https://docusaurus.io/docs/next/migration/translated-sites
Trying to fix i18n following Docusaurus migration guide. Using the Crowdin branch approach.

Currently I put new i18n file structure on Crowdin v2 branch (https://crowdin.com/project/bottender/content/files), but this should be merged to Crowdin master branch and change the branch being used in website/package.json.

The </a> changes is used to fix MDX format. (https://docusaurus.io/docs/next/i18n/crowdin#mdx)

[netlify]

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[codecov-commenter]

Codecov Report

Merging #958 (3b120b6) into master (cab2af6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #958   +/-   ##
=======================================
  Coverage   84.06%   84.06%           
=======================================
  Files         123      123           
  Lines        6350     6350           
  Branches     1622     1572   -50     
=======================================
  Hits         5338     5338           
- Misses       1003     1008    +5     
+ Partials        9        4    -5     

Impacted Files	Coverage Δ
packages/bottender/src/shared/getClient.ts	52.63% <0.00%> (ø)
packages/create-bottender-app/src/shared/log.ts	0.00% <0.00%> (ø)

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