fix post image size

layouts/partials/posts/post.html

@@ -12,9 +12,9 @@
       {{- partial "commons/image.html"
             (dict
               "image"    .Params.image
-              "mobile"   "351x291"
-              "tablet"   "334x167"
-              "desktop"  "634x317"
+              "mobile"   "350x350"
+              "tablet"   "450x450"
+              "desktop"  "900x900"
             ) -}}
     {{- else -}}
       {{- partial "commons/image-default.html" -}}