lebab: add page (#1951)

pages/common/lebab.md

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+# lebab
+
+> A JavaScript modernizer for transpiling code to ES6/ES7.
+> Transformations must be provided for all examples.
+
+- Display a list of the available transformations:
+
+`lebab --help`
+
+- Transpile using one or more comma-separated transformations:
+
+`lebab --transform {{transformation}}`
+
+- Transpile a file to stdout:
+
+`lebab {{path/to/input_file}}`
+
+- Transpile a file to the specified output file:
+
+`lebab {{path/to/input_file}} --out-file {{path/to/output_file}}`
+
+- Replace all `.js` files in-place in the specified directory, glob or file:
+
+`lebab --replace {{directory|glob|file}}`