Prefresh Webpack shouldn't assume the user is using NextJS

A user saw this pop up due to a minor version resolution issues w/ a Preact-CLI app which surprised them. Can we check if Next exists before providing this? Or maybe add a more generic error message?

prefresh/packages/webpack/src/index.js

Lines 122 to 130 in 018f5cc

    
               if (internalWebpackVersion !== externalWebpackVersion) { 
        
                 throw new Error(` 
        
                   Next is using webpack-version ${internalWebpackVersion} and you have ${externalWebpackVersion} installed. 
        
                   Try installing ${ 
        
                     compiler.webpack ? compiler.webpack.version : 4 
        
                   } locally. 
        
                   Or if you want to try webpack 5 you can turn this on with { future: { webpack5:true } } in you next.config.js. 
        
                 `);

A generic error message is probably a better shout as we don't support Next.JS anymore either way

	if (internalWebpackVersion !== externalWebpackVersion) {
	throw new Error(`
	Next is using webpack-version ${internalWebpackVersion} and you have ${externalWebpackVersion} installed.

	Try installing ${
	compiler.webpack ? compiler.webpack.version : 4
	} locally.
	Or if you want to try webpack 5 you can turn this on with { future: { webpack5:true } } in you next.config.js.
	`);