Potential fix for links without trailing forward slash

[DrDrij]

On the homepage, links to the materials section (eg. Materials Library heading) do not work if they have a trailing forward slash. Result in 404.

Addressing issue #60

Working: "https://econ-ark.org/materials" Causing 404: "https://econ-ark.org/materials/"

Implementing config update as potential fix, from: https://stackoverflow.com/questions/54727643/trailing-slashes-in-jekyll-github-pages-site-cause-404

[DrDrij]

Difficult to test as links behave differently locally.