Update cheatsheets

tldr/rnano

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rnano
+
+> A restricted version of `nano`.
+> Command-line text editor with restricted drive access.
+> See also: `nano`.
+> More information: <https://manned.org/rnano>.
+
+- Start the editor:
+
+`rnano`
+
+- Open a specific file:
+
+`rnano {{path/to/file}}`
+
+- Display help:
+
+`rnano {{[-h|--help]}}`