docs: drop sphinx and use doxygen exclusively (#2932)

docs/third_party_packages.md

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+# Third-Party Packages
+
+@danger{These packages are not maintained by LizardByte. Use at your own risk.}
+
+## Chocolatey
+[![Chocolatey](https://img.shields.io/badge/dynamic/xml.svg?color=orange&label=chocolatey&style=for-the-badge&prefix=v&query=%2F%2Ftr%5B%40id%3D%27chocolatey%27%5D%2Ftd%5B3%5D%2Fspan%2Fa&url=https%3A%2F%2Frepology.org%2Fproject%2Fsunshine%2Fversions&logo=chocolatey)](https://community.chocolatey.org/packages/sunshine)
+
+## Flathub
+[![Flathub](https://img.shields.io/flathub/v/dev.lizardbyte.app.Sunshine?style=for-the-badge&logo=Flathub)](https://flathub.org/apps/dev.lizardbyte.app.Sunshine)
+
+## nixpkgs
+[![nixpkgs](https://img.shields.io/badge/dynamic/xml.svg?color=orange&label=nixpkgs&style=for-the-badge&prefix=v&query=%2F%2Ftr%5B%40id%3D%27nix_unstable%27%5D%2Ftd%5B3%5D%2Fspan%2Fa&url=https%3A%2F%2Frepology.org%2Fproject%2Fsunshine%2Fversions&logo=nixos)](https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/servers/sunshine/default.nix)
+
+## Scoop
+[![Scoop (extras bucket)](https://img.shields.io/scoop/v/sunshine.svg?bucket=extras&style=for-the-badge&logo=data:image/vnd.microsoft.icon;base64,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)](https://scoop.sh/#/apps?s=0&d=1&o=true&q=sunshine)
+
+## Solus
+[![Solus](https://img.shields.io/badge/dynamic/xml.svg?color=orange&label=Solus&style=for-the-badge&prefix=v&query=%2F%2Ftr%5B%40id%3D%27solus%27%5D%2Ftd%5B3%5D%2Fspan%2Fa&url=https%3A%2F%2Frepology.org%2Fproject%2Fsunshine%2Fversions&logo=solus)](https://dev.getsol.us/source/sunshine)
+
+<div class="section_buttons">
+
+| Previous                      |                                            Next |
+|:------------------------------|------------------------------------------------:|
+| [Docker](../DOCKER_README.md) | [Gamestream Migration](gamestream_migration.md) |
+
+</div>