Compile documentation with jsdoc

[pverscha]

The API that a Vue-component offers is not always directly clear. To improve maintainability of this project, we should indicate all events that are emitted by a component (as well as the props it takes in) using the JS Doc-extension jsdoc-vuejs (https://www.npmjs.com/package/jsdoc-vuejs).

To further improve this, we could even set up a GitHub-action that automatically compiles the documentation when a push occurs.

[pverscha]

I chose for the "vue-styleguidist"-package for compiling documentation for the different components as it looks the most promising. No GitHub-action that automatically compiles the documentation (and publishes it) is currently created.