docs: fix z-index issues

[tasosbit]

ℹ Overview

• Fix z-index & overlapping text issues with header

✅ Acceptance:

• Pre-commit checks pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.22%. Comparing base (915babb) to head (23ebdd5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage   32.22%   32.22%           
=======================================
  Files          76       76           
  Lines        6423     6423           
=======================================
  Hits         2070     2070           
  Misses       4241     4241           
  Partials      112      112           

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