improvement in ui and ux of footer links and back-to-top

[Mohit-Davar]

• Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines

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• What kind of change does this PR introduce?

/kind design

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• What this PR does / why we need it:
  This PR fixes footer alignment issues and improves overall UX.
  It ensures consistent padding, spacing, and typography for better visual balance.

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• Which issue(s) this PR fixes:
  Fixes #391 and #388

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• Before / After Comparison:

Before:
https://github.com/user-attachments/assets/d2113c2e-3bc3-4e8d-a4e4-b9e08ad97122

After:
https://github.com/user-attachments/assets/f6e582e8-5931-4c15-b022-03d060c86ac3

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[volcano-sh-bot]

Welcome @Mohit-Davar!

It looks like this is your first PR to volcano-sh/website.

Thank you, and welcome to Volcano. :smiley:

[volcano-sh-bot]

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