Fix blog post urls

src/blog/posts/posts.11tydata.js

@@ -1,5 +1,5 @@
 module.exports = {
     tags: ['posts'],
     layout: 'post.njk',
-        permalink: "/post/{{ data.slug if data.slug else title | slugify  }} "
+        permalink: "/post/{{ data.slug if data.slug else title | slugify  }}/"
 }