Change the behavior of the header menus

[ChrisEdS]

Description

Included in this PR:

• Dynamically adjusting the width of the left menu
• Changed the centering of the icons
• Automatic wrap to a second line after the third entry
• Hover effect in the left and right menu

Motivation and Context

After feedback from various sites after a dynamic adjustment of the width of the left menu, I implemented this here.

How Has This Been Tested?

• Manually tested (Chrome and Firefox)
• Works on other browsers as well (no special CSS tweaks)

Screenshots:

Before:

After:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #37490 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #37490   +/-   ##
=========================================
  Coverage     64.68%   64.68%           
  Complexity    19336    19336           
=========================================
  Files          1277     1277           
  Lines         75535    75535           
  Branches       1331     1331           
=========================================
  Hits          48860    48860           
  Misses        26283    26283           
  Partials        392      392           

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0.00 <ø> (ø)
#phpunit	65.84% <ø> (ø)	19336.00 <ø> (ø)

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[pmaier1]

Thx 👍 (not a technical review :) )

[phil-davis]

@ChrisEdS I am not sure why you have merged these phpstan commits into your branch. Actually in your local git clone you just do something like:

git fetch origin
git checkout master
git pull
git checkout menu-improvements
git rebase master
git push -f

And then also you still need to add a changelog.

[phil-davis]

Tested with chrome and works.