build: simplify devbox configuration and scripts

- Remove unnecessary Rust tools from devbox configuration
- Simplify the devbox shell initialization script
- Update the devbox test script

Author: bresilla

Cargo.lock

@@ -1,26 +1,17 @@
 {
-    "packages": [
-        "rustc@latest",
-        "rustfmt@latest",
-        "cargo@latest",
-        "rust-analyzer@latest",
-        "clippy@latest",
-        "libiconv@latest",
-        "vscode-extensions.llvm-org.lldb-vscode@latest",
+  "packages": [
+    "rustc@latest",
+    "cargo@latest",
+    "rust-analyzer@latest"
+  ],
+  "shell": {
+    "init_hook": [
+      "echo 'Welcome to devbox!' > /dev/null"
     ],
-    "shell": {
-        "init_hook": [
-            "projectDir=$PWD",
-            "cargoHome=\"$projectDir\"/.direnv/cargo",
-            "mkdir -p $cargoHome",
-            "export CARGO_HOME=$cargoHome",
-            "export LIBRARY_PATH=$LIBRARY_PATH:\"$projectDir/.devbox/nix/profile/default/lib\"",
-            "export PATH=$PATH:$projectDir/target/release",
-        ],
-        "scripts": {
-            "test": "cargo test -- --show-output",
-            "start" : "cargo run",
-            "build-docs": "cargo doc"
-        }
+    "scripts": {
+      "test": [
+        "echo \"Error: no test specified\" && exit 1"
+      ]
     }
+  }
 }