misc: Avoid sample.md from in the VPP docs, clean up the extraneous copy

I had cleaned up the sample.md previously for 20.01, but when later
that was merged to master, the file was renamed. So, fix this issue.

Change-Id: I6347685af216901fbfdd445606735b9bf79f8fe5
Type: docs
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

extras/configs/http/sample.md

@@ -1,82 +0,0 @@
----
-title: Home
----
-
-# VPP Status
-
-### Here's the version...
-
-VPP version: <div id="VPPversion"></div>
-
-build date: <div id="VPPbuilddate"></div>
-
-<div id="like_button_container"></div>
-
-### Show Interface
-
-<p>Enter the interface name, then click "Submit" to display interface stats:</p>
-
-<input id="ifacename" type="text"></input>
-<button onclick="getStats()">Get Stats</button>
-
-<div id="ifacestats"></div>
-
-{{< rawhtml >}}
-
-<script>
-function getStats() {
-    var url="http://192.168.10.1:1234/interface_stats.json?";
-    var iface=document.getElementById("ifacename").value;
-    url=url.concat(iface);
-    fetch(url, {
-        method: 'POST',
-        mode: 'no-cors',
-        cache: 'no-cache',
-        headers: {
-                 'Content-Type': 'application/json',
-        },
-})
-.then((response) => response.json())
-.then(function(obj) {
-      console.log(obj)
-      var result=obj.interface_stats.name;
-      result = result.concat(": rx-pkts: ");
-      result = result.concat(obj.interface_stats.rx_packets);
-      result = result.concat(" rx-bytes: ");
-      result = result.concat(obj.interface_stats.rx_bytes);
-      result = result.concat(": tx-pkts: ");
-      result = result.concat(obj.interface_stats.tx_packets);
-      result = result.concat(" tx-bytes: ");
-      result = result.concat(obj.interface_stats.tx_bytes);
-      result = result.concat(" drops: ");
-      result = result.concat(obj.interface_stats.drops);
-      result = result.concat(" ip4: ");
-      result = result.concat(obj.interface_stats.ip4);
-      result = result.concat(" ip6: ");
-      result = result.concat(obj.interface_stats.ip6);
-
-      document.getElementById("ifacestats").innerHTML=result;
-})
-.catch(function(error) {
-      console.log(error);
-})}
-// unconditionally populate vpp version info ->
-fetch('http://192.168.10.1:1234/version.json', {
-    method: 'GET',
-    mode: 'no-cors',
-    cache: 'no-cache',
-    headers: {
-         'Content-Type': 'application/json',
-    },
-})
-.then((response) => response.json())
-.then(function(obj) {
-      document.getElementById("VPPbuilddate").innerHTML=obj.vpp_details.build_date;
-      document.getElementById("VPPversion").innerHTML=obj.vpp_details.version;
-})
-.catch(function(error) {
-      console.log(error);
-});
-</script>
-
-{{< /rawhtml >}}