cjxl, djxl: add page (#13513)

Co-authored-by: spageektti <git@spageektti.cc>

pages/linux/cjxl.md

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+# cjxl
+
+> Compress images to JPEG XL.
+> Accepted input extensions are PNG, APNG, GIF, JPEG, EXR, PPM, PFM, PAM, PGX, and JXL.
+> More information: <https://github.com/libjxl/libjxl>.
+
+- Convert an image to JPEG XL:
+
+`cjxl {{path/to/image.ext}} {{path/to/output.jxl}}`
+
+- Set quality to lossless and maximize compression of the resulting image:
+
+`cjxl --distance 0 --effort 9 {{path/to/image.ext}} {{path/to/output.jxl}}`
+
+- Display an extremely detailed help page:
+
+`cjxl --help --verbose --verbose --verbose --verbose`

pages/linux/djxl.md

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+# djxl
+
+> Decompress JPEG XL images.
+> Accepted output extensions are PNG, APNG, JPEG, EXR, PGM, PPM, PNM, PFM, PAM, EXIF, XMP and JUMBF.
+> More information: <https://github.com/libjxl/libjxl>.
+
+- Decompress a JPEG XL image to another format:
+
+`djxl {{path/to/image.jxl}} {{path/to/output.ext}}`
+
+- Display an extremely detailed help page:
+
+`djxl --help --verbose --verbose --verbose --verbose`