Move pages back into a "pages" folder

pages/common/ls.md

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+# ls
+
+> List directory contents
+
+- List all files, even hidden
+
+`ls -a`
+
+- List all file names (no extra info)
+
+`ls -A1`
+
+- List all files with their rights, groups, owner
+
+`ls -ls`
+
+- List all files with a prefix/suffix
+
+`ls {{prefix}}*`
+`ls *{{suffix}}`
+
+- Sort the results size
+
+`ls -s   # by size`
+`ls -t   # by last modified date`
+`ls -U   # by creation date`
+
+- Reverse the order of the results
+
+`ls -r`