docs: add docs to just recipes

Justfile

@@ -2,45 +2,56 @@
 _default:
 	@just --list
 
+# Show machine name
 [group("utils")]
 machine:
 	@echo "${HOSTNAME}"
 
+# Format and remove dead code 
 [group("utils")]
 clean-code:
 	sudo nix run nixpkgs#deadnix -- -eq
 	sudo nix run nixpkgs#nixfmt-tree
 
+# Switch configuration
 [group("maintenance")]
 switch args="":
 	nh os switch -a -H "${HOSTNAME}" . {{args}}
 
+# Initialize a new machine
 [group("setup")]
 new-machine:
 	sudo nixos-rebuild switch --flake .#${HOSTNAME}
 
+# Switch configuration without making it the default boot option 
 [group("maintenance")]
 test:
 	nh os test -a -H "${HOSTNAME}" .
 
+# Update flake.nix
 [group("maintenance")]
 update flake="":
 	nix flake update {{flake}}
 
+# Run update and switch
 [group("maintenance")]
 upgrade: update switch
 
+# Collect garbage
 [group("maintenance")]
 clean:
 	sudo nix-collect-garbage -d
 
+# Optimise nix store (very long operation) 
 [group("maintenance")]
 optimise:
 	sudo nix-store --optimise
 
+# Run clean and optimise
 [group("maintenance")]
 clean-all: clean optimise
 
+# List generations
 [group("maintenance")]
 generations:
 	@nh os info