feat: Add auto-update startup scripts for turtle, webbridge, and pocket computers

STARTUP_README.md

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+# Auto-Update Startup Scripts
+
+These scripts automatically download and run the latest versions of your turtle control programs when computers start up.
+
+## Installation
+
+### For Turtles:
+```lua
+wget https://git.spatulaa.com/MayaTheShy/remoteturtle/raw/branch/master/startup_turtle.lua startup
+```
+
+### For Webbridge Computer:
+```lua
+wget https://git.spatulaa.com/MayaTheShy/remoteturtle/raw/branch/master/startup_webbridge.lua startup
+```
+
+### For Pocket Computer:
+```lua
+wget https://git.spatulaa.com/MayaTheShy/remoteturtle/raw/branch/master/startup_pocket.lua startup
+```
+
+## How It Works
+
+1. **On boot**, the startup script runs automatically
+2. **Removes** the old version of the main script
+3. **Downloads** the latest version from git
+4. **Executes** the downloaded script
+
+## Fallback Behavior
+
+If the download fails (no internet, wrong URL, etc.):
+- Shows an error message
+- Attempts to run the existing version if available
+- Shows manual download instructions
+
+## Benefits
+
+✅ Always run the latest version  
+✅ No manual script management  
+✅ Just reboot to update  
+✅ Fallback to existing version if offline  
+✅ Clear status messages  
+
+## Manual Update
+
+To force an update on a running computer:
+```lua
+reboot
+```
+
+## Changing the URL
+
+If you need to change the git URL, edit the `SCRIPT_URL` variable in the startup script:
+```lua
+local SCRIPT_URL = "https://your-git-url-here/script.lua"
+```
+
+## Disabling Auto-Update
+
+To disable auto-update and use manual management:
+```lua
+rm startup
+```
+
+Then download scripts manually as needed.