Remove NPM prepare script

scripts/prepare.js

@@ -1,12 +0,0 @@
-const { execSync } = require('child_process');
-
-/**
- * The npm `prepare` script needs to run a build to support installing
- * a package from git repositories (this is dumb but a limitation of how
- * npm behaves). We don't want to run these in CI though because
- * building is slow so this script will skip the build when the
- * `SKIP_PREPARE` environment variable has been set.
- */
-if (!process.env.SKIP_PREPARE) {
-    execSync('webpack --config webpack.prod.js', { stdio: 'inherit' });
-}