Move pages under tldr, lint run.sh, update docs

tldr/linux/pacdiff

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pacdiff
+
+> Maintenance utility for `.pacorig`, `.pacnew` and `.pacsave` files created by `pacman`.
+> More information: <https://man.archlinux.org/man/pacdiff>.
+
+- Review files that need maintenance in interactive mode:
+
+`pacdiff`
+
+- Use sudo and sudoedit to remove and merge files:
+
+`pacdiff --sudo`
+
+- Review files needing maintenance, creating `.bak`ups of the original if you `(O)verwrite`:
+
+`pacdiff --sudo --backup`
+
+- Use a specific editor to view and merge configuration files (default is `vim -d`):
+
+`DIFFPROG={{editor}} pacdiff`
+
+- Scan for configuration files with `locate` instead of using `pacman` database:
+
+`pacdiff --locate`
+
+- Display help:
+
+`pacdiff --help`