Changed highlighting of the current day to be more visible

[bbBowser]

Changed color of current day, to be more visible on screens with bad contrast (from #ffc to #ffa)

[mention-bot]

@bbBowser, thanks for your PR! By analyzing the history of the files in this pull request, we identified @georgehrke, @raghunayyar and @tcitworld to be potential reviewers.

[georgehrke]

Hey :)

Thx for your contribution! :)
When submitting design pull requests please always provide before and after screenshots.

Please also explain why you think this change is necessary.

Thx :)

[bbBowser]

Sorry for those short explanations ;)
I had problems to find the current day on several laptop or office screens, when the viewing angle was not perfect.
I think the current highlight has not enough contrast to fit those "not perfectly calibrated screens".
Since made it just a little darker, the overall appearance is not changed very much.

before:

after:

Thx for your patience and good work,
bbBowser

[tcitworld]

Related #119

[georgehrke]

pls review @nextcloud/designers :)

[MariusBluem]

I like it 👍

[enoch85]

OK with me as well 👍

[georgehrke]

btw, I don't mean to hijack this thread, but most other calendar applications color the days of the weekend slightly grey.
Did we decide against that intentionally? If yes, why?

[enoch85]

@georgehrke Gray is better imho actually.