doc: add a reference to the PipeWire Under The Hood post

A good writeup that provides more details than our own documentation, so let's at least link to it.
PipeWire · Jun 24, 2021 · 50e015f · 50e015f
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@@ -30,6 +30,6 @@ See \ref page_api
 ### Resources
 
 * [LAC 2020 Paper](https://lac2020.sciencesconf.org/307881/document)
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+* [PipeWire Under The Hood](https://venam.nixers.net/blog/unix/2021/06/23/pipewire-under-the-hood.html)
 
 */