Avoid multiple redirects in sidebar links

[danielcompton]

The sidebar links for elements look like: https://htmlreference.io/element/article.

If I click on that link, it 301 redirects to http://htmlreference.io/element/article/ (note HTTP), then to https://htmlreference.io/element/article/ (note HTTPS and a trailing slash). It would be much faster to load pages if the sidebar linked directly to the final URL.