feat: add i18n to docs

[tobySolutions]

Please describe the changes this PR makes and why it should be merged:

Status

• [x] Setup i18n according to Nextra docs
• [x] Fix 404 pages routing issues
• [x] Add Scaffold to support Chinese, French, Spanish
• [x] Add Scaffold to support Chinese, French, Spanish for blogs
• [ ] Open issues to make all the translations needed
• [x] Fix AI page being weird

Semantic versioning classification:

• [ ] This PR changes the codebase
  • [ ] This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • [ ] This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• [x] This PR only includes non-code changes, like changes to documentation, README, etc.

[coveralls]

Pull Request Test Coverage Report for Build 7611881086

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 25.706%

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Totals
Change from base Build 7594145411:	0.0%
Covered Lines:	1257
Relevant Lines:	5082

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💛 - Coveralls

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[SalahAdDin]

Oh man, 89 files?

[tobySolutions]

Oh man, 89 files?

Yep yep! I have been busy actually.

[tobySolutions]

Can you help review this @aidenybai? Thanks!

[tobySolutions]

Thanks for the review @aidenybai 🙌