Add UEFI/BIOS beep documentation

[Githubguy132010]

Description

This pull request addresses issue #116 by adding comprehensive documentation about disabling beeps at the firmware level (UEFI/BIOS). Even with all the system-level beep disabling provided by this project, some computers might still emit beeps from the firmware during POST, and these cannot be controlled by the operating system.

Changes Made

Added a new section to the README.md titled "Complete Silence: Disabling Firmware Beeps" that includes:

• Explanation of firmware beeps vs. operating system beeps
• Instructions on accessing UEFI/BIOS settings
• A table of common beep setting locations by manufacturer
• Navigation differences between UEFI and Legacy BIOS
• Terminology guide for beep-related settings
• Manufacturer-specific notes for Dell, HP, Lenovo, and ASUS systems
• Post-configuration steps and alternatives

Benefits

• Provides users with information to achieve truly silent computing by addressing all beep sources
• Helps users understand which beeps can be controlled by the OS vs. firmware
• Offers manufacturer-specific guidance for finding the right settings
• Suggests alternatives when BIOS beep disabling isn't available

Documentation Standards

• Clear, structured organization with headings and subheadings
• Tabular format for easy reference of manufacturer-specific information
• Consistent formatting and terminology
• Accessible language for users with varying technical expertise

Fixes #116