docs: add box footer and box header documentation

[stevenevan]

Closes #573 #574

Current Tasks

• Implemented box header variants
• Implemented box footer variants

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
11.6% Duplication

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/kata-ai/aksara-ui/9MKtSgREG8ZqfXzNNgT8SkBp6Y6a
✅ Preview: https://aksara-ui-git-docs-box-header-footer-kata-ai.vercel.app

[codecov]

Codecov Report

Merging #666 (6a736cc) into master (e235501) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #666   +/-   ##
=======================================
  Coverage   57.81%   57.81%           
=======================================
  Files         196      196           
  Lines        1901     1901           
  Branches      597      597           
=======================================
  Hits         1099     1099           
  Misses        802      802           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e235501...6a736cc. Read the comment docs.