Update Dockerfile for ttfautohint, update metrics
Summary: Update the MathJaxFonts `Dockerfile` to enable the use of `ttfautohint` which hints our fonts better. Also, fix the location that batik is downloaded from, update some formatting in the `Dockerfile`, and update the fonts and metrics. Test Plan: - Compare a rendered `= - A z 4 \Longrightarrow \Sigma \Biggl(` in Chrome on Windows at font sizes 10px to 20px before and after this change. - See that characters look about the same, or better. - See that the screenshot tests didn't change in firefox (maybe firefox runs the same autohinting algorithm that we do?), and don't visually change in chrome Reviewers: kevinb, alpert Reviewed By: kevinb, alpert Differential Revision: https://phabricator.khanacademy.org/D18977
Emily Eisenberg
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