feature/RZA-250103 - Add Keyboard Shortcut Navigation

[Suresh-Chelani]

Description

This PR adds a keyboard shortcut feature implemented using Astro.js, CSS, and vanilla JavaScript, similar to platforms like GitHub.

Features:

• press ? to open the keyboard shortcut help menu
• Press ESC to close the help popup
• Homepage using /, h, or H
• About page using g + h

Fixes #103

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Verified all shortcuts work correctly on desktop browsers.
• Confirmed navigation behavior with all defined key combinations.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[Suresh-Chelani]

Screenshot: