Fix menu errors, tunneling bugs, and improve README

[EricksonAtHome]

Summary

Fixes the most common runtime errors reported in issues (#66, #77, #53) and rewrites the README with accurate setup instructions.

Changes

blackeye.sh

• Accept zero-padded menu input (01, 06, 34) so users are no longer shown Invalid option!
• Check that sites/<template> exists before starting the PHP server (prevents cd: No such file or directory)
• Fix Localtunnel mode, which previously launched ngrok and called a missing lt binary
• Install/use Localtunnel from node_modules via npm install
• Add startup checks for required tools (php, jq)
• Run the PHP server in a subshell so the script working directory stays correct
• Improve ngrok URL detection for newer ngrok-free.app domains
• Stop deleting .gitignore and other repo files on launch
• Avoid infinite menu loops when stdin is not interactive

README.md

• Reorganized with clear requirements, installation, usage, and troubleshooting sections
• Documents which templates are actually included in this repository
• Replaces broken markdown/callout syntax and outdated download instructions
• Adds platform-specific install examples (Debian/Ubuntu, Termux, WSL)

Testing

• bash -n blackeye.sh passes
• Verified 01 maps to Instagram and shows a friendly missing-template message instead of crashing
• Verified piped invalid input exits instead of looping forever