cavif: add page (#10468)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/cavif.md

@@ -0,0 +1,20 @@
+# cavif
+
+> PNG/JPEG to AVIF converter.
+> More information: <https://github.com/kornelski/cavif-rs>.
+
+- Convert a JPEG file to AVIF:
+
+`cavif {{path/to/file.jpg}}`
+
+- Adjust the image quality (1-100) and convert a PNG file to AVIF:
+
+`cavif --quality {{60}} {{path/to/file.png}}`
+
+- Set the output location explicitly:
+
+`cavif {{path/to/file.jpg}} --output {{path/to/file.avif}}`
+
+- Overwrite the destination file if it already exists:
+
+`cavif --overwrite {{path/to/file.jpg}}`