feat: add MHS35 script for Kali Linux on Raspberry Pi 5

[Flo5k5]

Summary

• Adds MHS35-show-kali-pi5 script for Kali Linux on Raspberry Pi 5 compatibility
• Auto-detects boot directory (/boot/firmware/ vs /boot/)
• Works without raspi-config dependency

Problem

The original MHS35-show script fails on Kali Linux / Pi 5 with errors:

grep: /boot/cmdline.txt: No such file or directory
cp: cannot create regular file '/boot/overlays/': Not a directory
sudo: raspi-config: command not found

Solution

New script that:

• Detects correct boot partition location
• Properly installs display overlay
• Configures touchscreen with evdev driver
• No raspi-config dependency

Test plan

• Tested on Raspberry Pi 5
• Tested on Kali Linux ARM64
• MHS35 3.5" LCD working after reboot