Add deleted-post page

src/pages/deleted-post.md

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+---
+title: This post was removed
+description: A message about removed content
+hide_table_of_contents: true
+---
+
+# You probably got here visiting a link somewhere on the internet
+
+Sorry to say, but this post was removed because of one of the reasons (or because of all of them):
+- It was critically outdated
+- It was misleading
+- It was stupid
+- It has no historical value
+
+You can check my [other blog posts](/blog) or start from the [home page](/).