Add ui.logo_home_url as config.yaml option

[tw4l]

Description

Adds a new ui.logo_home_url option to config.yaml which allows users to specify a URL that the banner logo should link to. If left unset, the logo will by default not link anywhere.

Motivation and Context

Connected to #790, which describes how the previous behavior sometimes linked to the wrong page, especially for prefixed instances.

Types of changes

• Replay fix (fixes a replay specific issue)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added or updated tests to cover my changes.
• All new and existing tests passed.