fix: arrow svg compatible with dark mode and responsiveness of text

[Karan-Palan]

What kind of change does this PR introduce?

• Improved the color contrast of arrows in "Go Back" and "Up Next" buttons in dark mode. (used #2563EB for Arrow svg i.e color used for hyperlinks across the website)
• Ensured consistent vertical stacking and alignment of text and arrows across screen sizes.

Issue Number:

• Closes 🐛 Bug: Low Contrast on Arrows in "Go Back" and "Up Next" Buttons in Dark mode and responsiveness issue #1292

Screenshots/videos:

If relevant, did you update the documentation?

No

Summary

Does this PR introduce a breaking change?

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
website	✅ Ready (View Log)	Visit Preview	32c8a11

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (60f2d6a) to head (32c8a11).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1468   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           10        10           
  Lines          396       396           
  Branches       106       106           
=========================================
  Hits           396       396           

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[Karan-Palan]

Based on #1292 (comment), made these changes:

Screencast.from.2025-03-16.14-30-04.webm

@DhairyaMajmudar , ptal

[DhairyaMajmudar]

Much better now, Thanks!