⚡ add custom URL link option to top header logo

[colinwilson]

Changes

• Add an option to customize the destination URL of the top header logo in the /docs.
• Partial fix for #128

Tests

• [x] Automated tests have been added
• [ ] This PR does not require tests

Documentation

• [x] Docs have been updated
• [ ] This change does not need a documentation update

Dark mode

• [ ] The UI has been tested both in dark and light mode
• [x] This PR does not change the UI

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