feat: favicon

[jonandernovella]

Related issue(s) and PR(s)

This PR relates to NBISweden/mimir#18

Type of change

• 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 not work as expected)
• Other

List of changes made

• Added mimir favicon
• Remove unused icons
• Override default app name and descriptions

Testing

• Rebuild the client
• Restart containers

Definition of Done checklist

• I have made an effort making the commit history understandable
• I have performed a self-review of my own code and commented any hard-to-understand areas
• Tests and lint/format validations are passing
• My changes generate no new warnings
• Make sure layout and text follows design sketches, if there are any