dir: add page (#6817)

pages/linux/dir.md

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+# dir
+
+> List directory contents using one line per file, special characters are represented by backslash escape sequences.
+> Works as `ls -C --escape`.
+> More information: <https://manned.org/dir>.
+
+- List all files, including hidden files:
+
+`dir -all`
+
+- List files including their author (`-l` is required):
+
+`dir -l --author`
+
+- List files excluding those that match a specified blob pattern:
+
+`dir --hide={{pattern}}`
+
+- List subdirectories recursively:
+
+`dir --recursive`
+
+- Display help:
+
+`dir --help`