Complete the switch to axios as http library

[Confectrician]

Most parts should have already been covered with axios now already.

We should:

• Implement basic auth settings with axios in a native way
• Think about refactoring the utils file and move every api related parts to a new manager class which handles the configuration and auth on its own.

This way we can declutter the several places where connection parameters are used and probably provide a more useful error checking too.