do not use escape brackets for forward_title and back_title

[zkamvar]

I was going through old issues and I realize this is a bug from {varnish}, not {sandpaper}. Specifically, this is caused by the Mustache templating escaping values.

So any place that contains {{forward_title}} or {{back_title}} needs to be changed to either include an ampersand or triple curlies (see https://mustache.github.io/mustache.5.html):

varnish/inst/pkgdown/templates/content-chapter.html

Lines 22 to 25 in b013dd8

	<a class="chapter-link float-end" href="{{#site}}{{root}}{{/site}}{{page_forward}}" rel="next">
	{{#forward_title}}Next: {{forward_title}}... {{/forward_title}}{{^forward_title}}Home{{/forward_title}}
	<i aria-hidden="true" class="small-arrow" data-feather="arrow-right"></i>
	</a>

Originally posted by @zkamvar in carpentries/workbench#71 (comment)