opusenc: move from linux to common (#4860)

pages/linux/opusenc.md

@@ -1,20 +0,0 @@
-# opusenc
-
-> Convert WAV or FLAC audio to Opus.
-> More information: <https://opus-codec.org/docs/opus-tools/opusenc.html>.
-
-- Convert WAV to Opus using default options:
-
-`opusenc {{path/to/input.wav}} {{path/to/output}}.opus`
-
-- Convert stereo audio at the highest quality level:
-
-`opusenc --bitrate {{512}} {{path/to/input.wav}} {{path/to/output}}.opus`
-
-- Convert 5.1 surround sound audio at the highest quality level:
-
-`opusenc --bitrate {{1536}} {{path/to/input.flac}} {{path/to/output}}.opus`
-
-- Convert speech audio at the lowest quality level:
-
-`opusenc {{path/to/input.wav}} --downmix-mono --bitrate {{6}} {{path/to/out}}.opus`