If this '/' is not present, then the second pagination code snippet
under the "Render the paginated Posts" section will have a bug.
Let's say my page 1 is located at host:port/blog/index.html and my
paginate_path setting in _config.yml is "blog/page:num/". The
observation if the paginate_path does not start with a '/' is that the href generated for the page numbers will have 2 'blogs', i.e. for page 2 the href will
incorrectly appear as 'host:port/blog/blog/page2' instead of just
'host:port/blog/page2'.
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