Update cheatsheets

tldr/linux/aur

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# aur
+
+> Build packages from the AUR and manage local repositories.
+> Note: A local repository needs to be set in `/etc/pacman.conf` and `vifm` needs to be installed for this to fully function.
+> More information: <https://github.com/aurutils/aurutils>.
+
+- Search the AUR database for a package:
+
+`aur search {{keyword}}`
+
+- Download a package and its dependencies from AUR, build them and add them to a local repository:
+
+`aur sync {{package}}`
+
+- [l]ist packages available in your local repository:
+
+`aur repo --list`
+
+- [u]pgrade local repository packages:
+
+`aur sync --upgrades`