Improve ux with clean navigation and better a11y

[manuelmeister]

I tried to improve on the current design. I also improved the accessibility of the navigation and forms.

Feature Deployment: https://manuelmeister.github.io/hering/

Improved navigation on mac:

before	after

Improved calendar: https://manuelmeister.github.io/hering/#/calendar

before	after

[manuelmeister]

@mario-zelger can you have a look? 😊

[mario-zelger]

Very nice, thank you! Will check it out tomorrow and most likely merge right away 👍

[ewangler]

@manuelmeister very very cool! thanks a lot! 🎉 i love the fish 🐟

there is just one small thing that i'm not 100% sure about: in the calendar you changed the link to the chapter to "Kapitel". i get that and it's better because it's shorter, but maybe it's also not that clear for a user. maybe there is an other label like "Zum Kapitel" or "Mehr Infos"...

[mario-zelger]

I manually merged the pull request on my side because I realized that I forgot to push one commit before the fall courses. Of course there were some conflicts 🤦‍♂️.

Unfortunately, GitHub does not seem to have recognized that merge here. Therefore, I would close this one without an explict merge via GH.

@manuelmeister Can you check out the current develop branch? All of your changes should be there.

[manuelmeister]

Strange 🤨

[manuelmeister]

@mario-zelger don't forget to deploy

[mario-zelger]

all done 👍 thank you very much!