code: func (c *RenderController) Render(ctx *app.RenderRenderContext) error {
  	content := ctx.Payload.Data.Attributes.Content
  	markup := ctx.Payload.Data.Attributes.Markup
  	if !rendering.IsMarkupSupported(markup) {
  		return jsonapi.JSONErrorResponse(ctx, errors.NewBadParameterError("Unsupported markup type", markup))
  	}
  	htmlResult := rendering.RenderMarkupToHTML(content, markup)
  	res := &app.MarkupRenderingSingle{Data: &app.MarkupRenderingData{
  		ID:   uuid.NewV4().String(),
  		Type: RenderingType,
  		Attributes: &app.MarkupRenderingDataAttributes{
  			RenderedContent: htmlResult,
  		}}}
  	return ctx.OK(res)
  }
docs: // Render runs the render action.