define uiRootPath var in head instead of footer

Author: mojavelinux

src/partials/footer-scripts.hbs

@@ -1,4 +1,3 @@
-<script>window.uiRootPath = '{{{uiRootPath}}}'</script>
 <script src="{{{uiRootPath}}}/js/site.js"></script>
 <script async src="{{{uiRootPath}}}/js/vendor/highlight.js"></script>
 {{#with (resolvePage page.relativeSrcPath model=false)}}

src/partials/head-scripts.hbs

@@ -2,3 +2,4 @@
     <script async src="https://www.googletagmanager.com/gtag/js?id={{this}}"></script>
     <script>function gtag(){dataLayer.push(arguments)};window.dataLayer=window.dataLayer||[];gtag('js',new Date());gtag('config','{{this}}')</script>
     {{/with}}
+    <script>var uiRootPath = '{{{uiRootPath}}}'</script>