Added hamburger menu

[shivasankaran18]

Closes #358

Made Sidebar Collapsible in the learning page for better User Experience

Changes

• Made Sidebar Collapsible by adding hamburger menu
• It is consistent for both light and dark theme

Flags

Screenshots or Video

Related Issues

• Issue #
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Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

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[shivasankaran18]

@DianaLease @dselman @sanketshevkar could you review the PR when you find the time?