Replace complex webpack build process with @wordpress/scripts

[2ndkauboy]

PR #61 aims to make compilations possible with an older version of node.js but I think the biggest issue with the current plugin is the complex directory layout and build process by using webpack directly.

This PR aims to replace it with @wordpress/scripts while also turning the plugin directory layout into a standard WordPress plugin, so it's no longer necessary to clone it to a random directory and symlinking the dist folder (under a different name) into the wp-content/plugins folder on the WordPress installation, you want to use it in.

It also dramatically reduces the number of NPM dependencies, making future developments easier.

🚨 This is a huge breaking change though, given that the directory structure changes, so anyone using it would have to replace the symlink with the plugin directly!

[zzap]

This is a big step forward and definitely the right way to go. Great work 🙌

[ironprogrammer]

Nice! 🙌🏻 This update works on my machine...😂

I cleared out the old node_modules folder prior to npm install to avoid a build error. I'd previously used v14. Successfully ran npm run build under v17 🚀

• OS: macOS 12.5.1
• Browser: Safari 15.6.1
• PHP: 7.4.30
• WordPress: wordpress-develop:trunk

Regarding the directory structure changes, note that users can still utilize a symlink, e.g. from the updated root of this project run:

ln -s "$PWD" ~/path-to-wordpress/wp-content/plugins/contributor-orientation-tool

After re-linking and the initial page load with the plugin active, I refreshed and WordPress figured out the new path.

I'll close out #61 in favor of this.