Broken images in API documentation

Some (but not all) of the images on Cayenne Docs are broken. Tested in Firefox and Chrome.

The URL of one of the broken images is
When trying to access that image, I get HTTP 403 with the following contents.
<Error><Code>AccessDenied</Code><Message>Access Denied</Message><RequestId>E2C63ACDDAE054E7</RequestId><HostId>ELPj+LcVb1GgTvV8ZWzOOre+fbupNW3NTUvaSAyRF9fSlQ+b/7Y63FeQPV5St1OguBM+tWZ79CY=</HostId></Error>
Chrome says this in the console:
Mixed Content: The page at '' was loaded over HTTPS, but requested an insecure image ''. This content should also be served over HTTPS Failed to load resource: the server responded with a status of 403 (Forbidden)

Firefox says this:
Using //@ to indicate sourceMappingURL pragmas is deprecated. Use //# instead [Learn More] jquery.js:1 XML Parsing Error: not well-formed Location: Line Number 1, Column 2: Loading mixed (insecure) display content "" on a secure page [Learn More] jquery.js:4:31666 Loading mixed (insecure) display content "" on a secure page [Learn More] jquery.js:4:31666 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. jquery.js:3:31293 Will-change memory consumption is too high. Budget limit is the document surface area multiplied by 3 (1364412 px). Occurrences of will-change over the budget will be ignored. cayenne-api Source map error: SyntaxError: JSON.parse: unexpected character at line 2 column 5 of the JSON data Resource URL: Source Map URL:

This image on the same page is visible: which indicates that the problem isn’t with mixed content.

I reported this in #support on Slack but am posting it here as well in case anyone else has the same problem, and so it doesn’t get lost in the Slack log.