Design tweaks

[HenrikeW]

NOTE: Before this PR is merged, the help page needs to be changed according to the changes in design.
If you approve, let me know so that I can update the help page before you merge.

Related issue(s) and PR(s)

This PR closes #443.

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

• the eye icon was replaced with an X
• X and star icon were moved to the left of a row for aesthetic reasons
• the distance between the two icons was increased to improve usability
• the white margin below the header was decreased. In this process, unnecessary divs were removed

Screenshot of the fix

Testing

• the page should work in the same way as before. Test if it does.

Further comments

• The way GitHub marks changes it looks like a lot has changed in the JSX code in Report.tsx.
  In fact, only two divs were removed, the one starting in line 563 (className="usr-header") and the one starting in line 576 (className="main").
• Issue Design tweaks #443 also contains one action point to make sure the footer is properly aligned. This will be fixed in PR #333: Replaced placeholder with label according to accessibility guid… #455 that also updates overall styling of the footer.

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

[KattisLej]

Starting code review

[KattisLej]

I've tested the time logging and it works as before, the icons look good!

[ghost]

Improvements, for sure! The only thing I think is weird is that if you, using keyboard navigation, press the favorite star to add a new favorite. the cursor jumps to the first line/row/issue of non-favorites instead of staying on the star/issue you made a favorite. This is not a blocker for merge, though.