Update cheatsheets

linux/apx

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apx
+
+> Package management utility with support for multiple sources, allowing you to install packages in subsystems.
+> More information: <https://github.com/Vanilla-OS/apx>.
+
+- View documentation for managing package managers:
+
+`tldr apx pkgmanagers`
+
+- View documentation for managing stacks:
+
+`tldr apx stacks`
+
+- View documentation for managing subsystems:
+
+`tldr apx subsystems`