customize page: add Adjust audio quality and microphone sensitivity

[basisbit]

Added a section Adjust audio quality and microphone sensitivity to the Customize documentation.

[sualko]

I think it is an interesting read, but I would enjoy some recommendations e.g. to reduce bandwidth or to increase quality.

[GhaziTriki]

Hi guys,

This is what I read when I was working on creating the audio configuration shared in this link:

https://groups.google.com/g/bigbluebutton-setup/c/3Y7VBllwpX0/m/41X9j8bvCAAJ

I took the work that Fairkom shared and tried to improve it.

There is a big chance you see it in 2.3 by default 😉

[ffdixon]

We're still figuring out the audio configuration for 2.3-dev ... working on it!

[ffdixon]

Hi @basisbit, we want to merge this in. Could you take a moment and resolve the conflict -- thanks!