[del] remove whaleslide (website is down)

      require_api_key: false

      results: HTML

  - name: whaleslide

    shortcut: whale

    engine: json_engine

    paging: true

    # This API Token is needed to work

    search_url:

      https://search.whaleslide.com/api/v1/search_v2/web/{pageno}?q={query}&api_token=f8OhUDEYKUICHDnIxEgI7Cb4uYyTBqT4nO8iueNbfTO3devS24yElGqM7nCm

    url_query: url

    title_query: title

    title_html_to_text: true

    content_query: abstract

    content_html_to_text: true

    categories: general

    disabled: true

    about:

      website: https://whaleslide.com/

      wikidata_id:  # No Wikidata page

      official_api_documentation: false

      use_official_api: false

      require_api_key: false

      results: JSON

  - name: naver

    shortcut: nvr

    engine: xpath