Change 👥motion automations to ⌛timers

[dannytsang]

I didn't realise timers in Home Assistant are persistent after restarts until @thejeffreystone video: https://youtu.be/SuLPMxQUv0Q

Checklist of motion controlled rooms starting with one as a test:

• [x] lounge
• [ ] kitchen
• [x] office
• [x] conservatory
• [ ] stairs
• [ ] bathroom
• [x] bedroom
• [x] Porch

[dannytsang]

Converting this back. For some reason, the timers don't start as reliably and I'm not sure why.