added notes and rebuilt flake

README.md

@@ -1,7 +1,39 @@
 # A Dendritic Nix Flake
 
+Regenerate flake and switch to it.
+
 ```shell
-nix run ".#write-flake"
+nix run .#write-flake
 nix flake check
 home-manager switch --flake .#desktop
 ```
+
+```shell
+nix flake show --all-systems
+```
+
+## Mechanics
+
+### Flake
+
+The top-level flake is created using [flake-file](https://flake-file.oeiuwq.com/)
+
+```shell
+nix flake init -t github:vic/flake-file#default
+...
+nix run ".#write-flake"
+```
+
+This uses `inputs.flake-parts.lib.mkFlake` to create the flake.
+
+The modules are automatically imported from the `./modules` using [import-tree](https://import-tree.oeiuwq.com/).
+
+
+### [Home Manager](https://flake.parts/options/home-manager.html)
+
+Uses the home-manager module of flake-parts, which is imported in `modules/home-manager/flake-parts.nix`
+
+Looks for options:
+
+- `flake.homeConfigurations`
+- `flake.homeModules`