docs: Add link to source and modified time to footer of every page

docs/config.json

@@ -16,6 +16,7 @@
     "~$",
     "^\\."
   ],
+  "enableGitInfo": true,
   "markup": {
     "goldmark": {
       "extensions": {

docs/layouts/_default/baseof.html

@@ -40,6 +40,8 @@
             <div class="card card-body">
               <p style="font-size: 90%;">
                 &copy; <a href="https://www.craig-wood.com/nick/">Nick Craig-Wood</a> 2014-{{ now.Format "2006" }}<br>
+                {{ if .File}}Source file <a href="https://github.com/rclone/rclone/blob/master/docs/content/{{ .File.Path }}">{{ .File.Path }}</a>
+                last updated <a href="https://github.com/rclone/rclone/commit/{{ with .GitInfo }}{{ .Hash }}{{ end }}">{{ .Lastmod.Format "2006-01-02" }}</a><br>{{end}}
                 Website hosted on a <a href="https://www.memset.com/dedicated-servers/vps/"><span style="font-weight: bold; font-family: arial black, arial, sans-serif; font-style: italic;">MEMSET CLOUD VPS</span></a>,
                 uploaded with <a href="https://rclone.org">rclone</a>
                 and built with <a href="https://github.com/spf13/hugo">Hugo</a>.