Fix alt overlay issue and deprecate support outside github.com and gist.github.com host.
#13
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Fixes #12
Context
Previously the text overlay was styled to appear over the image. This resulted in text covering the image. Another problem was that when there were multiple images on the same line, the captions for each image will overlap on top of each other.
Instead, we have the text overlay appear below the image and a border outlining the image and overlay to group it together. Additionally, we ensure that the alt text overlay is added when image is nested inside
tableand other elements, not just<p>.This also turns off the extension outside of the
github.comandgist.github.comdomain where support may be wonky.Screenshots
Before:
After: