Move services/ajaxversions.php, keeping history

[linawolf]

Move the file from the to be archived repository https://github.com/TYPO3-Documentation/typo3-docs-typo3-org-resources/blob/master/webroot/services/ajaxversions.php

[brotkrueml]

As discussed with Lina. First we rename the script and compare the output of the current script and this script. So we are safe, we do not overwrite a newer version with an old version on deployment.

[linawolf]

I renamed the file to match the class name