Added wip nix page

docs/alpine-desktop-setup/post-install/nix.md

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+# Nix (WIP - don't follow)
+
+The *Nix package manager* is a package manager which allows for user independent packages and a whole lot more (although it's not necessarily minimal). To set it up install it's package and activate it's service:
+
+## Setup
+
+```
+# apk add nix
+# rc-update add nix-daemon default
+# rc-service nix-daemon start
+```
+
+> (The `nix` package is only available in the `edge` and `apk-ample` repositories)
+
+And add this line to `/etc/nix/nix.conf` to globally enable some features which will be necessary later:
+
+```
+experimental-features = nix-command flakes
+```
+
+Don't forget to add your user to the nix group:
+
+```
+adduser <username> nix
+```
+
+## Usage
+
+> From here on things have to be done per user.
+
+Now that Nix is up and running utilize the `flake` that comes with the config files to set up our home for us:
+
+```
+$ cd ~/.config/home-manager
+$ nix run . switch
+```
+
+Now you are able to install packages as a user without root from `nixpkgs`:
+
+```
+$ nix-env -iA nixpkgs.<package>
+```
+
+> You can also test a package before installing it with `nix-shell -p <program>`
+
+### Home-Manager
+
+### Nix-Bubblewrap
+
+### NixGL