docs: add badge for experimental/beta/deprecated status next to version in backend docs

docs/layouts/_default/baseof.html

@@ -26,7 +26,20 @@
     <div class="container-fluid">
       <div class="row">
         <div class="col-md-9">
+          {{ $statusMap := dict
+            "deprecated" "This feature is currently deprecated."
+            "experimental" "This feature is currently experimental and any use is at your own risk."
+            "beta" "This feature is currently in beta must be used with care."
+          }}
+
           {{ if .Params.versionIntroduced }}<span class="badge badge-pill badge-secondary float-right" style="margin-top: 30px; font-size: 100%" title="This feature needs Rclone {{ .Params.versionIntroduced }} or later.">{{ .Params.versionIntroduced }}</span>{{ end }}
+
+          {{ with .Params.status | lower }}
+            {{ $statusCode := . }}
+            {{ $statusMessage := index $statusMap $statusCode }}
+            <span class="badge badge-pill badge-danger float-right" style="margin-top: 30px; font-size: 100%" title="{{ $statusMessage }}">{{ $statusCode }}</span>
+          {{ end }}
+
           {{ block "main" . }}
           {{ end }}
         </div>