docs: Fix prerequisite subsection links

docs/src/prerequisites/index.md

@@ -2,9 +2,9 @@
 
 To run `wasm-pack` you'll need to have both Rust and npm installed and configured.
 
-- [Rust](/prerequisites/rust.html)
+- [Rust](./rust.html)
-- [npm](/prerequisites/npm.html)
+- [npm](./npm.html)
 
 In the future, we intend to rewrite the npm registry client bits so that the need
-for a Node runtime is eliminated. If you're excited about that work- you should 
+for a Node runtime is eliminated. If you're excited about that work- you should
 reach out to the maintainers and get involved!