Remove Express + unused dependencies

[amoore108]

Summary

• Removes Express and dependencies related to it
• Removes other dependencies that are no longer in use or can be replaced by built-in Node APIs, like URL and fetch
• Removes webpack configs. Maintains the main webpack dependency as its used by Storybook
• Removes @loadable as we now use next/dynamic for lazy loading components
• Removes url-parse as we can now use the native URL interface for constructing URLs
• Removes now unneeded @babel dependencies, but not all of them as some are still required to run the src/app unit tests
• Removes all the getInitialData folders for the page types
• Removes applyBasicPageHandlers and the PageHandlers Higher Order Components as these are not needed
• Removes the src/server folder which started the Express app. Keeps the utility files still used in the Next.js app
• Removes the src/integration folder as its no longer used
• Removes the <App /> component which rendered the Express app
• Removes unneeded scripts in package.json
• Removes --nextJS arg from integration test runner and commands
• Moves utilities used by the Next.js from the Express app, into the Next utilities folder
• Moves the Renderers folder into the Next.js app
• Creates new #utilities alias to route to the ws-nextjs-app/utilities folder
• Fixed tsc errors in the Next app
• Some 'modernisation' + general tidy up of files not used anymore

Useful Links

• Coding Standards
• Repository use guidelines
• Add Links to useful resources related to this PR if applicable.

[hotinglok]

Instead of outright removing this, could we maybe point dev and other common commands like test to the NextJs folder? Just a lazy suggestion, can prefix commands with something like:

run-p --cwd ./ws-nextjs-app

[amoore108]

Possibly, although I'd encourage we start merging the 2 package.jsons together.

I wouldn't want some weird behaviours happening when folks run the Next app from the root directory, but maybe I'm being overly cautious?

[hotinglok]

I'd be in favour of merging the package.jsons, definitely safer. Would be good to audit/review which commands we still want too. I can make a tech ticket for that too

[hotinglok]

Feels like this should also be updated rather than removed. May be better done in a tech/other ticket

[amoore108]

I feel like it should be done when/if we uplift the Next.js app to the root directory. Tech ticket is a good idea. Don't really want it kept since it gives a false impression to devs and AI about how the application behaves.

[andrewscfc]

🚆 Express leaves the station