fixes #5

New linter rules:
* curly
* block-spacing
* keyword-spacing

Also apply all autofixes introduced by these rules

Our linting config in package.json was:
```
    "extends": [
      "plugin:vue/essential",
      "eslint:recommended"
    ],
```

Now switching to "plugin:vue/recommended" and apply all auto-fixes

does not work yet, we always get back a 400 when
logo or image are not null in json format

have to find out how the exact format and encoding has to be to update
a show inlcuding files

still TODO regarding OIDC:
* handle token expiration and refreshing

still TODO regarding ShowManager:
* finalize all requests for ShowManagerModal*
* change getting notes: we now have a note_id in every timeslot
* handle repetitions when updateing timeslots & notes
* creation of new timeslots and collision handling