Improve menu

[dagadeta]

There are some things that can be improved in the navigation menu:

• Refine the "Links" section in the menu by replacing the buttons with icons and removing the website entry
• Make the Buttons to access and close the menu look better. Maybe add some animations too. Something like this would be great.
• Fade In / Fade Out the menu when opening and closing it
• Remove the "Rechtliches" section as it has no right to exist in the navigation menu and already exists in the footer
• In the headers, ignore the fact that letters like q, g and p go deeper than other letters to prevent the appearence that there are some differences in spacing
• As the menu now has much less content, it would look empty if it still was a full-screen popup. Make the menu popup so small that it has just enough space for its content and center it vertically. You should be able to see most of the page then, which should be slightly grayed out or gently overlayed by a shadow of the menu popup.
• Add the ability to click/tap outside the popup to close it