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>

website/content/volunteer/guide/_index.md

@@ -8,4 +8,8 @@ aliases = ["/contribute"]
 book = true
 +++
 
-We're glad that you are interested in contributing to Graphite! We want to make it as easy and frictionless as possible for you to get started. Here are the basics.
+Welcome, potential contributor! We're excited to have you join the Graphite project and it's our goal to make the process as smooth as possible. This guide will serve as your library of knowledge to help you get started contributing to the project. If you find any information missing or unclear, please let us know [through Discord](https://discord.graphite.rs) or submit a pull request to help document the process for future contributors.
+
+<p>
+<img src="https://static.graphite.rs/content/volunteer/code-contributions.avif" onerror="this.onerror = null; this.src = this.src.replace('.avif', '.jpg')" alt="Flavor graphic depicting a library of knowledge in a digital realm" />
+</p>