Move legacy script to assets folder

JavaScript should be in "assets/js"; move the miscellaneous legacy
script code there.

layouts/partials/hooks/head-end.html

@@ -112,3 +112,6 @@
 <!--for the splitter-->
 <!--script src="https://unpkg.com/split.js/dist/split.min.js"></script-->
 <script src="/js/split-1.6.0.js" integrity="sha384-0blL3GqHy6+9fw0cyY2Aoiwg4onHAtslAs4OkqZY7UQBrR65/K4gI+hxLdWDrjpz"></script>
+
+{{- $legacyScriptJs := resources.Get "js/legacy-script.js" -}}
+<script src="{{ $legacyScriptJs.RelPermalink }}"></script>

layouts/partials/scripts.html

@@ -1,5 +1,3 @@
-<script src="{{ "js/script.js" | relURL }}"></script>
-
 {{/* Handle legacy Kubernetes shortcode for Mermaid diagrams */}}
 {{- if (.HasShortcode "mermaid") -}}
 {{ .Page.Store.Set "hasmermaid" true -}}