feat(#171): supports display raw content

public/partials/explorer.htm

@@ -20,6 +20,12 @@
             ng-href="{{url}}"
             target="__self"
             class="btn btn-outline-primary btn-sm"
+            >View raw</a
+          >
+          <a
+            ng-href="{{url}}?download=true"
+            target="__self"
+            class="btn btn-outline-primary btn-sm"
             >Download file</a
           >
           <a