feat: add squid widget in swap page

[odcey]

WIP: (Will need to add the npmrc token)

• Adds Squid widget
• Handle darkmode / lightmode
• Possibility to switch between classic swap & cross chain swap

Screenshots:

[vercel[bot]]

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[odcey]

Updated Tabs to be "Celo" & "Cross-chain" Updated code to use Squid iframe instead of react package

• Lighter website
• No build problem