Only show stable add-ons in the store if not advanced mode

[ludeeus]

Breaking change

Proposed change

If the user have not enabled advanced mode they should only see add-ons that are have the "stable" stage (not "experimental" or "deprecated")

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request: Add note about advanced mode for experimental and deprecated add-ons developers.home-assistant#1207

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io