Move pages back into a "pages" folder

pages/common/grep.md

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+# grep
+
+> Matches patterns in input text
+> Supports simple patterns and regular expressions
+
+- search for an exact string
+ 
+`grep {{something}} {{file_path}}`
+
+- search recursively in current directory for an exact string
+
+`grep -r {{something}} .`
+
+- use a regex
+
+`grep -e {{^regex$}} {{file_path}}`
+
+- see 3 lines of context
+
+`grep -C 3 {{something}} {{file_path}}`
+
+- print the count of matches instead of the matching text 
+
+`grep -c {{something}} {{file_path}}`
+
+- use the standard input instead of a file
+
+`cat {{file_path}} | grep {{something}}`