Feature: add rm command to remove applications from ozy

[AveryClapp]

Summary

• Adds new rm command to remove installed applications from ozy
• Removes the symlink from ~/.ozy/bin/
• Optional --clear-cache flag to also remove cached versions from ~/.cache/ozy/
• Defaults to preserving cache unless explicitly requested

Changes

• Added Rm command variant to CLI with app_name argument and optional --clear-cache flag
• Implemented rm() function that removes symlinks and optionally clears cache
• Added informative output messages for removal operations

Usage

# Remove app symlink only (preserves cache)
ozy rm <app_name>

# Remove app symlink and cached versions
ozy rm <app_name> --clear-cache