fix(styling): navigation + buttons

[jonrxu]

• Some styling changes for navigation and buttons, and other small fixes.
• Replacing outdated CSS with new Tailwind styling.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.41%. Comparing base (ef44d80) to head (69f6d87).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #311   +/-   ##
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  Coverage   90.41%   90.41%           
=======================================
  Files          62       62           
  Lines        2681     2681           
=======================================
  Hits         2424     2424           
  Misses        257      257           

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[vcai122]

Also a more general question. If we are revamping? Should we still keep the styled components such as Button, Link, etc.?