add routing behind UC4 logo

[tobias-wiese]

Description

Implements issue #267

Reason for this PR

• Logo was already a button, but did not route on a landing page

Changes in this PR

• the logo is now a button with an underlying on click listener that routes the user to the welcome or the login page

Type of change (remove all that don't apply)

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Manually tested all use cases this could alter

Test Configuration:

• OS: Windows

• Browser: Firefox

• Frontend: (remove all that don't apply)

  • Development build

• Backend: (remove all that don't apply)

  • No backend needed to test this

Checklist: (remove all that don't apply)

• I have performed a self-review of my own code
• My changes generate no new linting warnings or console warnings
• I have updated the CHANGELOG.md to include any changes made in this PR (add WIP to the top, if there is none already)