feat: enable French and Portuguese preview

[Keith-CY]

French: https://nervos-official-website-git-enable-fr-and-pt-magickbase.vercel.app/fr Portuguese: https://nervos-official-website-git-enable-fr-and-pt-magickbase.vercel.app/pt

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Name	Status	Preview	Comments	Updated (UTC)
nervos-official-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2023 10:50am

[matt-nervos]

@Keith-CY are these translations ok?

[WhiteMinds]

Do we need more options here?

Or just rely on the automatic switching behavior?

[Keith-CY]

@Keith-CY are these translations ok?

This PR is for a preview and proofreading of French & Portuguese, so I haven't checked the translation, nor have I added the FR & PT entries in the language list.

The proofreading requires support from the community

Ref: https://discord.com/channels/@me/1074822398941085746/1118493497067065404

[Keith-CY]

Do we need more options here?

Or just rely on the automatic switching behavior?

We'll extend the language list once the translations are ready, and I've left a question about the style of the language list at https://discord.com/channels/@me/1074822398941085746/1118493497067065404