title: Custom templates in pkgdown
body: <p><a href="https://github.com/r-lib/pkgdown/blob/b620ea1cc17b3b959165f8de7c7a063bfd09b2f0/R/render.r#L9" rel="nofollow noreferrer">Here</a>, the <a href="https://github.com/r-lib/pkgdown" rel="nofollow noreferrer">pkgdown</a> docs say that I can supply my own templates (footer, etc) using the <code>templates_path</code> key in <code>_pkgdown.yml</code>. I am struggling to make <a href="https://github.com/r-lib/pkgdown" rel="nofollow noreferrer">pkgdown</a> notice my custom footer from <a href="https://github.com/wlandau-lilly/drake/commit/2ca610f932be8d504560027b70106b5d57e3f0ea" rel="nofollow noreferrer">https://github.com/wlandau-lilly/drake/commit/2ca610f932be8d504560027b70106b5d57e3f0ea</a>, and I have not been able to find any guiding examples.</p>