Move pages back into a "pages" folder

pages/common/sed.md

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+# sed
+
+> Run replacements based on regular expressions
+
+- replace all occurrences of a string in a file, and print the result
+
+`sed 's/{{find}}/{{replace}}/g' {{filename}}`
+
+- replace all occurrences of a string in a file, and overwrite the file
+  contents
+
+`sed -i '' 's/{{find}}/{{replace}}/g' {{filename}}`
+
+- replace all occurrences of an extended regular expression in a file
+
+`sed -E 's/{{regex}}/{{replace}}/g' {{filename}}`