Minor opensearch route and description updates

Bumped version to 0.2.1 for next release

Updated image in opensearch template to use base64 image

Updated opensearch route to serve file as attachment

app/static/css/main.css

@@ -16,6 +16,7 @@ body {
     left: 50%;
     transform: translate(-50%, -50%);
     max-width: 600px;
+    z-index: 15;
 }
 
 .search-items {
@@ -127,10 +128,10 @@ footer {
     bottom: 0%;
     text-align: center;
     width: 100%;
-    z-index: -1;
+    z-index: 10;
 }
 
 .info-text {
     font-style: italic;
     font-size: 12px;
-}
+}