Remove broken Copilot code that would install wrong Asterisk version

Removed:
- install_easy_asterisk() function that installed Ubuntu Asterisk packages
- configure_easy_asterisk() function for non-existent addon
- Menu option 1 "Install Easy Asterisk" (broken implementation)
- Menu option 5 "Configure Easy Asterisk" (broken implementation)

The removed code would have:
- Installed default Ubuntu Asterisk (apt-get install asterisk)
- Created fake local config files
- Conflicted with actual Easy Asterisk from GitHub repo

Updated:
- Menu renumbered: Intercom is now option 1 (was option 2)
- Configure Intercom is now option 4 (was option 6)
- Updated README to reflect new menu numbers
- Updated error messages with correct option references

Result: Clean implementation with only the working GitHub-based
Easy Asterisk Intercom installer that properly manages versions
and preserves configurations.

Readme.md

@@ -410,7 +410,7 @@ The Easy Asterisk Intercom addon provides voice communication capabilities to yo
 ```bash
 ./install_kiosk_v0.9.9.sh
 # Select: 2) Manage Addons
-# Then: 2) Install/Update Intercom (Easy Asterisk)
+# Then: 1) Install/Update Intercom (Easy Asterisk)
 ```
 
 **Features:**
@@ -439,7 +439,7 @@ systemctl restart asterisk
 
 # Configure intercom
 ./install_kiosk_v0.9.9.sh
-# Select: 2) Manage Addons → 6) Configure Intercom
+# Select: 2) Manage Addons → 4) Configure Intercom
 ```
 
 **Installation location:**