Update cheatsheets

ls

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ls
+
+> List directory contents.
+> More information: <https://www.gnu.org/software/coreutils/ls>.
+
+- List files one per line:
+
+`ls -1`
+
+- List all files, including hidden files:
+
+`ls -a`
+
+- List all files, with trailing `/` added to directory names:
+
+`ls -F`
+
+- Long format list (permissions, ownership, size, and modification date) of all files:
+
+`ls -la`
+
+- Long format list with size displayed using human-readable units (KiB, MiB, GiB):
+
+`ls -lh`
+
+- Long format list sorted by size (descending) recursively:
+
+`ls -lSR`
+
+- Long format list of all files, sorted by modification date (oldest first):
+
+`ls -ltr`
+
+- Only list directories:
+
+`ls -d */`