Slightly improve configuration error messages

[dermotduffy]

• For Render better error messages when config is broken #101
• Still trying to see if I can get better error diagnostics for recursive configuration errors (e.g. conditional picture elements).

[github-actions]

🎉 HACS repository validator action summary 🎉
✅ The repository is not archived
✅ hacs.json has the 'name' key set
✅ The repository has a description
✅ The repository has topics
✅ The repository has issues enabled
✅ This day ends with an 'y' (Sunday)
✅ README.md exists
✅ Information file has images
⚪ Ignored check: hacs