optipng: add page

pages/common/optipng.md

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+# optipng
+
+> PNG image file optimization utility.
+
+- Compress a PNG with default settings:
+
+`optipng {{file.png}}`
+
+- Compress a PNG as optimally (but slowly) as possible:
+
+`optipng -o{{7}} {{file.png}}`
+
+- Compress a PNG as quickly (but non-optimally) as possible:
+
+`optipng -o{{0}} {{file.png}}`
+
+- Compress a PNG and add interlacing:
+
+`optipng -i {{1}} {{file.png}}`
+
+- Compress a PNG and remove all metadata:
+
+`optipng -strip all {{file.png}}`