If we create collections folder, its name should not have underscore! such as “collections”, “all_items”… _posts and _drafts need to be in collection
folder as well, if not no post artical will be shown on Jekyll website.
_config.yml should define where is collection folder!
Cannot render markdown file inside a html tag by include technique! But can capture / assign content from markdown file into a
variable, then load them as an object with option markdowntify