Update cheatsheets

pixiecore

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pixiecore
+
+> Manage the network booting of machines.
+> More information: <https://github.com/danderson/netboot/tree/master/pixiecore>.
+
+- Start a PXE boot server which provides a `netboot.xyz` boot image:
+
+`pixiecore {{quick}} xyz --dhcp-no-bind`
+
+- Start a new PXE boot server which provides an Ubuntu boot image:
+
+`pixiecore {{quick}} ubuntu --dhcp-no-bind`
+
+- List all available boot images for quick mode:
+
+`pixiecore quick --help`