feat(secrets)!: Replace sops with agenix-rekey

sops-nix is tending to be fairly complex for our use-cases, which adds
difficulty to deploying, maintaining our wrapper module, keeping
".env.bin" files, etc.

agenix-rekey is a lot simpler.

notable in this commit is the `// { outputPath = ...; }` hack in
flake.nix. This is needed due to snowfall-lib otherwise butchering paths
such that agenix-rekey is unable to show us what secrets exist with
`agenix edit`, etc... companion to that is the lib.snowfall.fs stuff in
the secrets/default.nix file

Change-Id: Id3e79cfc7d37a7b7de7b8cc42f7392c4d8bd07c5
Reviewed-on: https://git.clicks.codes/c/Infra/NixFiles/+/801
Reviewed-by: Skyler Grey <minion@clicks.codes>
Tested-by: Skyler Grey <minion@clicks.codes>
diff --git a/systems/x86_64-linux/teal/clicks.networking.tailscale.authKeyFile.age b/systems/x86_64-linux/teal/clicks.networking.tailscale.authKeyFile.age
new file mode 100644
index 0000000..3cd5dd9
--- /dev/null
+++ b/systems/x86_64-linux/teal/clicks.networking.tailscale.authKeyFile.age
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