Simplify build process by auto-installing npm packages and simplify the contributor guide (#1799)

* Clarify some of the contributing building instructions

* Bump wasm-bindgen version

* Simplify build process and improve docs

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

frontend/package.json

@@ -6,6 +6,7 @@
 	"browserslist": "> 1.5%, last 2 versions, not dead, not ie 11, not op_mini all, not ios_saf < 13",
 	"type": "module",
 	"scripts": {
+		"prestart": "node package-installer.js",
 		"start": "npm run build-wasm && concurrently -k -n \"VITE,RUST\" \"vite\" \"npm run watch:wasm\" || (npm run print-building-help && exit 1)",
 		"profiling": "npm run build-wasm-profiling && concurrently -k -n \"VITE,RUST\" \"vite\" \"npm run watch:wasm-profiling\" || (npm run print-building-help && exit 1)",
 		"production": "npm run build-wasm-prod && concurrently -k -n \"VITE,RUST\" \"vite\" \"npm run watch:wasm\" || (npm run print-building-help && exit 1)",
@@ -56,9 +57,6 @@
 		"vite": "^5.1.5",
 		"vite-multiple-assets": "1.2.10"
 	},
-	"optionalDependencies": {
-		"wasm-pack": "0.12.1"
-	},
 	"homepage": "https://graphite.rs",
 	"license": "Apache-2.0",
 	"repository": {