Few broken images in an article

[osmium8]

Describe the bug Few broken images in the article 'Service worker mindset'.

To Reproduce Steps to reproduce the behavior:

1. Go to 'Service worker mindest'

Expected behavior All images in the article should load.

[jpmedley]

@petele There's at least one broken image on this page.

[alexandrascript]

@petele assigning based on early comment, but feel free to re-assign to a TW

[AaronForinton]

Just a note that the missing image is a .gif - you can find it archived here. Wondering how you'd like to proceed on that basis @petele @heyawhite