This blog was made using the Jekyll theme "Clean Blog" :
"Start Bootstrap - Clean Blog Jekyll - Official Jekyll Version"
" Clean Blog Jekyll is a stylish, responsive blog theme for Bootstrap created by Start Bootstrap. This theme features a blog homepage, about page, contact page, and an example post page along with a working contact form powered by Formspree."
I've simply used this theme and added my own content to it. The instructions on how to use this theme are on their git hub page.
You will need to download all the prerequisites first: Jekyll, Ruby Git etc. See here
I use images which are not mine. These include: