Add DruxtWrapper examples for each component

[Decipher]

Is your feature request related to a problem? Please describe.
As a user I want examples of how to create a DruxtWrapper component for each Druxt component.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[Decipher]

Example DruxtBlock wrapper:

<template>
  <div>{{ block }}</div>
</template>

<script>
import { DruxtBlockMixin } from 'druxt-block'
export default {
  mixins: [DruxtBlockMixin]
}
</script>