flake.nix: reorganize

 - Kittybox's source code is moved to a subfolder
   - This improves build caching by Nix since it doesn't take changes
     to other files into account
 - Package and test definitions were spun into separate files
   - This makes my flake.nix much easier to navigate
   - This also makes it somewhat possible to use without flakes (but
     it is still not easy, so use flakes!)
 - Some attributes were moved in compliance with Nix 2.8's changes to
   flake schema

1 files changed, 12 insertions, 0 deletions

diff --git a/kittybox-rs/util/Cargo.toml b/kittybox-rs/util/Cargo.toml
new file mode 100644
index 0000000..31c6bca
--- /dev/null
+++ b/kittybox-rs/util/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "kittybox-util"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+[dependencies.serde]         # A generic serialization/deserialization framework
+version = "^1.0.125"
+features = ["derive"]
+