Make total hours cells non-navigatable

[jonandernovella]

Related issue(s) and PR(s)

This PR closes #482

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

• Made all total hours cells non navigatable
• Removed no longer used class from CSS

Testing

• Test using keyboard nav

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