Local dev instructions do not work

[jbalbien]

The instructions from https://github.com/country-regions/react-country-region-selector/blob/master/DEVELOPER.md no longer work as build/rollup.config.ts and build/minify-data.js are not available in the repo.

They seem to have been moved commit bc7bc24 but the build directory is ignored: https://github.com/country-regions/react-country-region-selector/blob/master/.gitignore#L27

% pnpm install                                 
Scope: all 5 workspace projects
Lockfile is up to date, resolution step is skipped
Already up to date
packages/react-country-region-selector prepare$ npm run minify-data
│ > [email protected] minify-data
│ > node build/minify-data.js
│ node:internal/modules/cjs/loader:1228
│   throw err;
│   ^
│ Error: Cannot find module 'react-country-region-selector/packages/react-country-region-selector/build/minify-data.js'
│     at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
│     at Module._load (node:internal/modules/cjs/loader:1051:27)
│     at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
│     at node:internal/main/run_main_module:28:49 {
│   code: 'MODULE_NOT_FOUND',
│   requireStack: []
│ }
│ Node.js v20.18.0