Home page testimonials are added in _data/doc_testimonial.yml, e.g.:

- title:
    Tinkety tonk old fruit victoria sponge squiffy bleeder twit the bee's knees loo
    David, buggered haggle pear shaped bubble and squeak.
  author: Penny Tool
  proff: Director of Sales and Success
  signImg: img/new/sign.png
  authImg: img/new/feedback_img_02.jpg

Add testimonial section to a page using the following include:

{% include doc_testimonial.html %}