Remove add-on store tab

[ludeeus]

Breaking change

Proposed change

• Remove add-ons store tab
• Change layout of add-on store from hass-tabs-subpage to hass-subpage
• The add-on store page is now opened by a fab on the dashboard tab.

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:

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

[balloob]

Nice!

[balloob]

I'm going to merge this because we shouldn't just update this documentation for this PR, but include all the changes we're planning on making (including updates moving). So let's do that at the end.

[ludeeus]

Yeah, mostly added that label so I do not forget to update the docs :)