oxipng: add page (#14274)

* 

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/oxipng.md

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+# oxipng
+
+> Losslessly improve compression of PNG files.
+> More information: <https://github.com/shssoichiro/oxipng>.
+
+- Compress a PNG file (overwrites the file by default):
+
+`oxipng {{path/to/file.png}}`
+
+- Compress a PNG file and save the output to a new file:
+
+`oxipng --out {{path/to/output.png}} {{path/to/file.png}}`
+
+- Compress all PNG files in the current directory using multiple threads:
+
+`oxipng "*.png"`
+
+- Compress a file with a set optimization level (default is 2):
+
+`oxipng --opt {{0|1|2|3|4|5|6|max}} {{path/to/file.png}}`
+
+- Set the PNG interlacing type (`0` removes interlacing, `1` applies Adam7 interlacing, `keep` preserves existing interlacing; default is `0`):
+
+`oxipng --interlace {{0|1|keep}} {{path/to/file.png}}`
+
+- Perform additional optimization on images with an alpha channel:
+
+`oxipng --alpha {{path/to/file.png}}`
+
+- Use the much slower but stronger Zopfli compressor with max optimization:
+
+`oxipng --zopfli --opt max {{path/to/file.png}}`
+
+- Strip all non-critical metadata chunks:
+
+`oxipng --strip all {{path/to/file.png}}`