ned: add page (#2787)

pages/common/ned.md

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+# ned
+
+> Is like `grep` but with powerful replace capabilities.
+> Unlike `sed`, as it isn't restricted to line oriented editing.
+
+- Recursively search starting in the current directory, ignoring case:
+
+`ned --ignore-case --recursive '{{^[dl]og}}' {{.}}`
+
+- Search always showing colored output:
+
+`ned --colors '{{^[dl]og}}' {{.}}`
+
+- Search never showing colored output:
+
+`ned --colors=never '{{^[dl]og}}' {{.}}`
+
+- Search ignoring certain files:
+
+`ned --recursive --exclude '{{*.htm}}' '{{^[dl]og}}' {{.}}`
+
+- Simple replace:
+
+`ned '{{dog}}' --replace '{{cat}}' {{.}}`
+
+- Replace using numbered group references:
+
+`ned '{{the ([a-z]+) dog and the ([a-z]+) dog}}' --replace '{{the $2 dog and the $1 dog}}' {{.}}`
+
+- Replace changing case:
+
+`ned '{{([a-z]+) dog}}' --case-replacements --replace '{{\U$1\E! dog}}' --stdout {{.}}`
+
+- Preview results of a find and replace without updating the target files:
+
+`ned '{{^[sb]ad}}' --replace '{{happy}}' --stdout {{.}}`