Pull Request as a helping hand for #30056 and #31735.

Summary of Changes

• The tool is now creating 4 pages, incompatible, noxml, fatal and incomplete
• The files are moved to media/system as these are static files
• Fixed all the paths for this change

Testing Instructions

Run npm install or node build/build.js --build-pages from the root path of your Joomla cloned repo
Check /templates/system for 4 html files: incompatible, noxml, fatal-error and build_incomplete
Open each in your browser (double click also works here)
You should have these:

Testing the actual php requires some editing of files (that's because it needs to kick the error):

• Front end change < to >

  joomla-cms/index.php

  Line 18 in f637260

  if (version_compare(PHP_VERSION, JOOMLA_MINIMUM_PHP, '<'))

  and check your front end (eg localhost/)
• Back end change < to >

  joomla-cms/administrator/index.php

  Line 18 in f637260

  if (version_compare(PHP_VERSION, JOOMLA_MINIMUM_PHP, '<'))

  and check your front end (eg localhost/)
• Installation change < to >

  joomla-cms/installation/index.php

  Line 18 in f637260

  if (version_compare(PHP_VERSION, JOOMLA_MINIMUM_PHP, '<'))

  also rename your root configuration.php to configuration.back and check your front end (eg localhost/)
• Installation change /media/vendor to /media/notexisting

  joomla-cms/installation/includes/app.php

  Line 18 in f637260

  if (!file_exists(JPATH_LIBRARIES . '/vendor/autoload.php') || !is_dir(JPATH_ROOT . '/media/vendor'))

  also rename your root configuration.php to configuration.back and check your front end (eg localhost/)

There are also 2 more cases that require this PR to be merge, then pull #30056 and 31735 and follow the testing instructions on these PR's

That's all.