[UI] improved design

- Added margins
- Added transition effect
- changed default color
- removed some borders
[UI] improved design part 2

- updated colors
- removed some border
- removed border-radius
- other visual improvements
Reducen paddings, add top border
[UI] added design improvements

- increased topper height by 4px
- changed border color
- reduced Laravel logo by 3px
Merge branch 'pr/1' of https://github.com/jaoued/laravel-debugbar into jaoued-pr/1
Merge branch 'jaoued-pr/1'
Cleanup comments