Docs update: Ui fixes

[rohit-710]

Description

• This PR fixes the logo breaking in white mode.
• Changes the sidebar colour and background colour during light mode.
• Uses a different asset during light mode.

Tests

• Tested locally with Docusauras and confirmed it with Abey.

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Name	Status	Preview	Comments	Updated (UTC)
reown-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 17, 2024 5:25am