website i18n refactor

[gdams]

Description of change

This change partially implements the i18n fixes I worked on in #1397.

Currently the i18n library doesn't work in the way we'd expect it to as it appends /index.lang to the path. E.g /docs/faq is localized as /de/docs/faq/index.de. This change fixes the rewrites to make the page named /de/docs/faq

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

[netlify]

✅ Deploy Preview for eclipsefdn-adoptium ready!

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[codecov]

Codecov Report

Merging #1485 (e0fc1cf) into main (da0a891) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head e0fc1cf differs from pull request most recent head 5f93a4e. Consider uploading reports for the commit 5f93a4e to get more accurate results

@@            Coverage Diff             @@
##             main    #1485      +/-   ##
==========================================
- Coverage   92.60%   92.59%   -0.01%     
==========================================
  Files          81       81              
  Lines        5812     5806       -6     
  Branches      514      514              
==========================================
- Hits         5382     5376       -6     
  Misses        430      430              

Impacted Files	Coverage Δ
src/__fixtures__/page.tsx	100.00% <100.00%> (ø)
src/templates/asciidocTemplate.tsx	100.00% <100.00%> (ø)

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[hendrikebbers]

No idea about the JS code (Gatsby config, build) :D but the Netlify preview looks good.

[zdtsw]

test with

• current website https://adoptium.net/zh-CN/docs/faq/index.zh-cn/
• from preview https://deploy-preview-1485--eclipsefdn-adoptium.netlify.app/zh-CN/docs/faq/