Update cheatsheets

linux/calcurse

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# calcurse
+
+> A text-based calendar and scheduling application for the command-line.
+> More information: <https://calcurse.org>.
+
+- Start `calcurse` on interactive mode:
+
+`calcurse`
+
+- Print the appointments and events for the current day and exit:
+
+`calcurse --appointment`
+
+- Remove all local calcurse items and import remote objects:
+
+`calcurse-caldav --init=keep-remote`
+
+- Remove all remote objects and push local calcurse items:
+
+`calcurse-caldav --init=keep-local`
+
+- Copy local objects to the CalDAV server and vice versa:
+
+`calcurse-caldav --init=two-way`