Fixed : the thumbnail display is not stable (#200)
diff --git a/themes/docsy/layouts/partials/head.html b/themes/docsy/layouts/partials/head.html
index 527b504..2fdfd76 100644
--- a/themes/docsy/layouts/partials/head.html
+++ b/themes/docsy/layouts/partials/head.html
@@ -1,5 +1,7 @@
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+<meta name="twitter:site" content="skywalking.apache.org">
+<meta name="twitter:image:src" content="https://skywalking.apache.org/images/skywalking_400x400.png">
<meta property="og:image" content="https://skywalking.apache.org/images/skywalking_400x400.png">
{{ hugo.Generator }}
<META NAME="ROBOTS" CONTENT="INDEX, FOLLOW">
