Update/Remove outdated documentation

docs/ARCHITECTURE.md

@@ -18,8 +18,8 @@ Documentation about the codebase appears in these locations:
 
 The backend of crates.io is written in Rust. Most of that code lives in the _src_ directory. It
 serves a JSON API over HTTP, and the HTTP server interface is provided by the [axum][] crate and
-related crates. More information about the backend is in
-[`docs/BACKEND.md`](https://github.com/rust-lang/crates.io/blob/master/docs/BACKEND.md).
+related crates. More information about backend development is in
+[`docs/CONTRIBUTING.md`](https://github.com/rust-lang/crates.io/blob/master/docs/CONTRIBUTING.md).
 
 [axum]: https://crates.io/crates/axum
 
@@ -37,8 +37,7 @@ The backend stores information in a Postgres database.
 
 ## Frontend - Ember.js
 
-The frontend of crates.io is written in JavaScript using [Ember.js][]. More information about the
-frontend is in [`docs/FRONTEND.md`](https://github.com/rust-lang/crates.io/blob/master/docs/FRONTEND.md).
+The frontend of crates.io is written in JavaScript using [Ember.js][]. More information about frontend development is in [`docs/CONTRIBUTING.md`](https://github.com/rust-lang/crates.io/blob/master/docs/CONTRIBUTING.md).
 
 [Ember.js]: https://emberjs.com/
 

docs/CONTRIBUTING.md

@@ -36,7 +36,7 @@ a documentation comment on it, it'd be great if you could add one to it too.
 
 When you submit a pull request, it will be automatically tested on GitHub Actions. In
 addition to running both the frontend and the backend tests described below,
-GitHub Actions runs [jslint], [clippy], and [rustfmt] on each PR.
+GitHub Actions runs [ESLint], [clippy], and [rustfmt] on each PR.
 
 If you don't want to run these tools locally, please watch the GitHub Actions results
 and submit additional commits to your pull request to fix any issues they find!
@@ -47,7 +47,7 @@ instructions and the [.github/workflows/ci.yml] file in this repository for the
 installation and running instructions. The logs for recent builds in GitHub Actions
 may also be helpful to see which versions of these tools we're currently using.
 
-[jslint]: http://jslint.com/
+[ESLint]: https://eslint.org/
 [clippy]: https://github.com/rust-lang-nursery/rust-clippy
 [rustfmt]: https://github.com/rust-lang-nursery/rustfmt
 [.github/workflows/ci.yml]: /.github/workflows/ci.yml
@@ -104,7 +104,7 @@ as well.
 
 In order to run the frontend on Windows and macOS, you will need to have installed:
 
-- [node](https://nodejs.org/en/) >= 18.16.0 (see `package.json` and `.github/workflows/ci.yml` for what we currently use)
+- [node](https://nodejs.org/en/) (see `package.json` engines field for the exact version required)
 - [pnpm](https://pnpm.io) >= 8.5.1
 
 Follow the links for each of these tools for their recommended installation
@@ -155,7 +155,7 @@ pnpm test
 
 In order to run the backend, you will need to have installed:
 
-- [Rust](https://www.rust-lang.org/en-US/) stable >= 1.56.0 and cargo, which comes with Rust
+- [Rust](https://www.rust-lang.org/en-US/) stable (see `rust-toolchain.toml` for version) and cargo, which comes with Rust
 - [Postgres](https://www.postgresql.org/) >= 9.5
 - [OpenSSL](https://www.openssl.org/) >= 1.0.2k
 - [diesel_cli](http://diesel.rs/guides/getting-started/) >= 2.0.0 and < 3.0.0