Move pages under tldr, lint run.sh, update docs

tldr/ssh-keyscan

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ssh-keyscan
+
+> Get the public ssh keys of remote hosts.
+> More information: <https://man.openbsd.org/ssh-keyscan>.
+
+- Retrieve all public ssh keys of a remote host:
+
+`ssh-keyscan {{host}}`
+
+- Retrieve all public ssh keys of a remote host listening on a specific port:
+
+`ssh-keyscan -p {{port}} {{host}}`
+
+- Retrieve certain types of public ssh keys of a remote host:
+
+`ssh-keyscan -t {{rsa,dsa,ecdsa,ed25519}} {{host}}`
+
+- Manually update the ssh known_hosts file with the fingerprint of a given host:
+
+`ssh-keyscan -H {{host}} >> ~/.ssh/known_hosts`