#982 ESCET website: fix async loading of news JS file.
- The previous approach had an issue. If the JS download finished after the DOM was already loaded, then the
DOMContentLoadedevent didn't happen anymore. - I now use
deferinstead ofasync, and no moreDOMContentLoadedevent. - This time I tested it also with local webserver, and this fixes it, at least locally.
Addresses #982