Update README.md to reflect recent changes

Author: arqunis

README.md

@@ -1,24 +1,28 @@
 # Site source code
 
-This is source code for the https://serenity-rs.github.io site, built using
-[Vite][vite].
+The source code for the https://serenity-rs.github.io site.
+
+The site is built using [Vite][vite].
 
 ## Contributing
 
-If you wish to contribute, simply set up a [Node.js][node] environment with the
-NPM package manager.
+To contribute, set up a [Node.js][node] environment with the PNPM package
+manager. You may install PNPM using the system package manager, `npm install -g
+pnpm`, or `corepack enable pnpm`.
+
+Install dependencies with `pnpm install`.
 
-Once you have Node and NPM, install the necessary dependencies with `npm install`.
+To develop the site, use `pnpm run dev` to spin up Vite's dev server to test
+changes locally. The dev server is configured to run on `localhost:3000` (or
+whichever spare port was selected in case `3000` was already taken).
 
-Afterwards, you may use `npm run dev` to run a dev server to test changes
-locally, which will run on `localhost:3000`. Once you are satisfied with the
-changes, run `npm run build` to build the site. This will create a minified,
-bundled version of the site into the `docs/` directory, which can directly be
-served by a HTTP server like [Nginx][nginx], though, of course, this site is
-meant to be run on Github Pages.
+Once you are satisfied with the changes, run `pnpm run build` to build the site,
+which will create a minified, bundled version of the site into the `dist/`
+directory. The contents of the `dist/` directory can directly be served by a
+static HTTP server like [Nginx][nginx], although this site is meant to run on
+Github pages.
 
-This site uses [TypeScript][ts] and [SCSS][sass-scss] instead of regular
-JavaScript and CSS. When writing CSS, the [BEM][bem] methodology is used.
+This site uses [TypeScript][ts] for scripting, and utilises the [BEM][bem] methodology for CSS.
 
 Media files, like images, sounds, and videos, are stored in the `public/`
 directory.
@@ -27,7 +31,6 @@ directory.
 [node]: https://nodejs.org
 [nginx]: https://nginx.org
 [ts]: https://typescriptlang.org
-[sass-scss]: https://sasscss.com
 [bem]: https://getbem.com/
 
 ## License