Cleanup user journeys related configs and scripts (#18814)

layouts/partials/docs/user-journey.html

@@ -1,22 +0,0 @@
-<div class="track">{{ .Params.track }}</div>
-<div class="topheader">
-   Introduction
-</div>
-<div class="sections">sections in this doc</div>
-<div id="user-journeys-toc" class="tablebar">
-<!-- This TOC section is populated with Javascript, see js/user-journeys-toc.js -->
-</div>
-
-<div class="docsection1">
-
-{{ partial "insert-capture" (dict "ctx" . "id" "overview" )}}
-
-{{- with .Scratch.Get "__cid_body" -}}
-{{ $body := replace .   `<h2` `</div><h2` }}
-{{ $body := replace $body  `</h2>`  `</h2><div class="docsection1">` | safeHTML  }}
-{{-  $body -}}
-{{- end -}}
-
-</div>
-
-<script src="{{ "js/user-journeys/toc.js" | relURL }}"></script>