Update cheatsheets

tldr/melt

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# melt
+
+> Backup and restore Ed25519 SSH keys using memorizable seed phrases.
+> More information: <https://github.com/charmbracelet/melt#usage>.
+
+- Generate a seed phrase from an existing Ed25519 private key:
+
+`melt {{~/.ssh/id_ed25519}}`
+
+- Generate a seed phrase from `stdin`:
+
+`{{cat ~/.ssh/id_ed25519}} | melt`
+
+- Restore an SSH key from a seed phrase:
+
+`melt restore {{path/to/key}} --seed "{{seed_phrase}}"`
+
+- Restore an SSH key from a seed phrase via `stdin`:
+
+`{{cat path/to/file}} | melt restore -`