Make images in tables unresponsive.
Make images in tables unresponsive.

Summary: See comment added to renderer.jsx for rationale.

Test Plan:
[Confirm that normal images in tables are now unresponsive.](http://localhost:9000/article.html#content=%5B%7B%22content%22%3A%22Front%20View%20%7C%20Back%20View%5Cn-%20%7C%20-%5Cn%21%5B%5D%28http%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2F29e6e23ae2f6187a5e6ca9b61497a1239780ac92.svg%29%20%7C%20%21%5B%5D%28http%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fab66e4e902803c2b4470775ad7e3b9b5115f2aa5.svg%29%5Cn%22%2C%22images%22%3A%7B%22http%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2F29e6e23ae2f6187a5e6ca9b61497a1239780ac92.svg%22%3A%7B%22width%22%3A200%2C%22height%22%3A134%7D%2C%22http%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fab66e4e902803c2b4470775ad7e3b9b5115f2aa5.svg%22%3A%7B%22width%22%3A200%2C%22height%22%3A134%7D%7D%2C%22widgets%22%3A%7B%7D%7D%5D)
[Confirm that web+graphie images in tables are now unresponsive.](http://localhost:9000/article.html#content=%5B%7B%22content%22%3A%22Area%20of%20a%20triangle%20%7C%20Area%20of%20a%20rectangle%5Cn%3A-%3A%20%7C%20%3A-%3A%5Cn%24A%3D%5C%5Cdfrac%7B1%7D%7B2%7D%20%5C%5Ctimes%20b%5C%5Ctimes%20h%24%20%7C%20%24A%3Db%5C%5Ctimes%20h%24%5Cn%21%5B%5D%28web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Faeae66e0e9f7337500b432abe432e2553068413e%29%20%7C%20%21%5B%5D%28web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fa728e00b9efa2ea2b9d7f70bf8dcab7f730051b9%29%5Cn%24A%3D15%20%5C%5Ctext%7B%20units%7D%5E2%24%20%7C%20%24A%3D30%20%5C%5Ctext%7B%20units%7D%5E2%24%22%2C%22images%22%3A%7B%22web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Faeae66e0e9f7337500b432abe432e2553068413e%22%3A%7B%22width%22%3A144%2C%22height%22%3A138%7D%2C%22web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fa728e00b9efa2ea2b9d7f70bf8dcab7f730051b9%22%3A%7B%22width%22%3A144%2C%22height%22%3A138%7D%7D%2C%22widgets%22%3A%7B%7D%7D%5D)
[Confirm that images outside of tables are still responsive.](http://localhost:9000/article.html#content=%5B%7B%22content%22%3A%22%21%5B%5D%28http%3A%2F%2Fwww.savethecat.com%2Fwp-content%2Fuploads%2F2015%2F06%2Fcats.jpg%29%5Cn%5Cn%21%5B%5D%28web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fa4b29e79547fad577c255230ff4f650924146a90%29%22%2C%22images%22%3A%7B%22http%3A%2F%2Fwww.savethecat.com%2Fwp-content%2Fuploads%2F2015%2F06%2Fcats.jpg%22%3A%7B%22width%22%3A1366%2C%22height%22%3A768%7D%2C%22web%2Bgraphie%3A%2F%2Fka-perseus-graphie.s3.amazonaws.com%2Fa4b29e79547fad577c255230ff4f650924146a90%22%3A%7B%22width%22%3A600%2C%22height%22%3A600%7D%7D%2C%22widgets%22%3A%7B%7D%7D%5D)

Fixes https://app.asana.com/0/27216215224639/41023898264930

Reviewers: sam, aria

Reviewed By: aria

Subscribers: sam

Differential Revision: https://phabricator.khanacademy.org/D19356

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