jpegoptim: add page (#1370)

* New command: jpegoptim

* Update jpegoptim.md

pages/common/jpegoptim.md

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+# jpegoptim
+
+> Optimise JPEG images.
+
+- Optimise a set of JPEG images, retaining all associated data:
+
+`jpegoptim {{image1.jpeg}} {{image2.jpeg}} {{imageN.jpeg}}`
+
+- Optimise JPEG images, stripping all non-essential data:
+
+`jpegoptim --strip-all {{image1.jpeg}} {{image2.jpeg}} {{imageN.jpeg}}`
+
+- Force the output images to be progressive:
+
+`jpegoptim --all-progressive {{image1.jpeg}} {{image2.jpeg}} {{imageN.jpeg}}`