Certain UI changes

[nishakp3005]

Navigation bar should have a semi-opaque background for more visibility.
The sections should be highlighted on the nav bar on visiting.
Search bar should be more clearly visible / Use a different icon for search bar.
Under about section the section-text should be left-aligned for more readability.
I would like to make these changes!

[github-actions]

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[github-actions]

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