chore: add prettier

.gitignore

···
+node_modules

bun.lock

···
+{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "@intergrav/dev.css",
+      "devDependencies": {
+        "prettier": "latest",
+      },
+    },
+  },
+  "packages": {
+    "prettier": ["prettier@3.7.4", "", { "bin": { "prettier": "bin/prettier.cjs" } }, "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA=="],
+  }
+}

package.json

···
 	"repository": "github:intergrav/dev.css",
 	"prettier": {
 		"useTabs": true
+	},
+	"devDependencies": {
+		"prettier": "^3.7.4"
 	}
 }