Broken images in Granite

[aggsol]

Describe the bug
Image from Granite are not display in Firefox 74 due to errors

To Reproduce

1. Goto https://valadoc.org/granite/Granite.Widgets.ModeButton.html
2. See missing image
3. Open image in new Tab (https://valadoc.org/granite/img/ModeButton.png)
4. See error message

Expected behavior
Images are displayed in Browser

Desktop

• Firefox 74, Windows 10

[ricotz]

Duplicate of #281

[aggsol]

@ricotz While #281 is indeed fixed. The broken images in Granite are still there.

[ricotz]

@aggsol Yeah this is a different issue.

[benwaffle]

looks like the "image" is actually the contents of the HTML file - the github page for https://github.com/elementary/granite/blob/master/doc/images/ModeButton.png

Maybe a URL somewhere needs to be updated to https://raw.githubusercontent.com/elementary/granite/master/doc/images/ModeButton.png ?