fix(head.html): Adds robustness to `config.yaml` favicon definitions

Geoffrey Garrett

2022-06-27 b732293f65999e9a1d3a40a5ddeccf53a385b1f3

 config.toml

@@ -28,3 +28,6 @@
        lineNumbersInTable = true
        style = "dracula"
        tabWidth = 4
    [frontmatter]
        lastmod = ["lastmod", ":git", "date", "publishDate"]
        publishDate = ["publishDate", "date"]