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Document the known nix-darwin related uninstall issue (#687)

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* Document the known nix-darwin related uninstall issue

* Fix nits

* Update README.md

Co-authored-by: Cole Helbling <cole.helbling@determinate.systems>

---------

Co-authored-by: Cole Helbling <cole.helbling@determinate.systems>
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@ -308,6 +308,41 @@ There are two possible workarounds for this:
</details>
### Using MacOS after removing `nix` while `nix-darwin` was still installed, network requests fail
If `nix` was previously uninstalled without uninstalling `nix-darwin` first, users may experience errors similar to this:
```bash
$ nix shell nixpkgs#curl
error: unable to download 'https://cache.nixos.org/g8bqlgmpa4yg601w561qy2n576i6g0vh.narinfo': Problem with the SSL CA cert (path? access rights?) (77)
```
This occurs because `nix-darwin` provisions an `org.nixos.activate-system` service which remains after Nix is uninstalled.
The `org.nixos.activate-system` service in this state interacts with the newly installed Nix and changes the SSL certificates it uses to be a broken symlink.
```bash
$ ls -lah /etc/ssl/certs
total 0
drwxr-xr-x 3 root wheel 96B Oct 17 08:26 .
drwxr-xr-x 6 root wheel 192B Sep 16 06:28 ..
lrwxr-xr-x 1 root wheel 41B Oct 17 08:26 ca-certificates.crt -> /etc/static/ssl/certs/ca-certificates.crt
```
The problem is compounded by the matter that the [`nix-darwin` uninstaller](https://github.com/LnL7/nix-darwin#uninstalling) will not work after uninstalling Nix, since it uses Nix and requires network connectivity.
It's possible to resolve this situation by removing the `org.nixos.activate-system` service and the `ca-certificates`:
```bash
$ sudo rm /Library/LaunchDaemons/org.nixos.activate-system.plist
$ sudo launchctl bootout system/org.nixos.activate-system
$ /nix/nix-installer uninstall
$ sudo rm /etc/ssl/certs/ca-certificates.crt
```
Then run the `nix-installer` again, and it should work.
Up-to-date versions of the `nix-installer` will refuse to uninstall until `nix-darwin` is uninstalled first, helping mitigate this problem.
## Building a binary
Since you'll be using `nix-installer` to install Nix on systems without Nix, the default build is a static binary.