chore(website): fix URLs in navigation bar

[welpo]

Description

Commit 1da7cac added Sponsor and GitHub links to the navigation bar. However, the links are not for this project.

This PR fixes these two links.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Thanks for opening this pull request! Please check out our contributing guidelines! ⛰️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (edc6bc0) 41.67% compared to head (c2a334c) 41.67%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #438   +/-   ##
=======================================
  Coverage   41.67%   41.67%           
=======================================
  Files          15       15           
  Lines        1020     1020           
=======================================
  Hits          425      425           
  Misses        595      595           

Flag	Coverage Δ
unit-tests	41.67% <ø> (ø)

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[orhun]

Good catch! Thanks <3

[welcome]

Congrats on merging your first pull request! ⛰️