Changed the worktree to one directory back (i.e. $HOME) and simplified the setup

dotfiles/ssh.md

@@ -0,0 +1,10 @@
+# Creating an elliptic curve keypair (ed25519)
+
+* Create: `ssh-keygen -a 100 -t ed25519 -f ~/.ssh/filename`
+* Schema check:
+    * `ssh-keygen -lf ~/.ssh/filename`
+    * `ssh-keygen -lf ~/.ssh/filename.pub`
+
+# Linux
+
+You might need to run `ssh-add ~/.ssh/id_rsa` after setting up your key.