message: Fix font handling in markdown view in production builds
  We can't reference the stylesheet, as its name changes when it gets minified
  Fixes
diff: @@ -23,10 +23,18 @@ const markdownConvert = (markdown) => {
  export const SyncMarkdownView = (props: {content: string}) => {
  const contents = `
  - <link href="static/app-bundle.css" rel="stylesheet">
  <style type="text/css">
  + @font-face {
  + font-family: "Source Sans Pro";
  + src: url(./assets/sourcesanspro-regular-webfont.eot);
  + src: url(./assets/sourcesanspro-regular-webfont.eot) format("embedded-opentype"),url(./assets/sourcesanspro-regular-webfont.woff) format("woff"),url(./assets/sourcesanspro-regular-webfont.ttf) format("truetype"),url(./assets/sourcesanspro-regular-webfont.svg) format("svg");
  + font-weight: 400;
  + font-style: normal;
  + font-stretch: normal;
  + }
  +
  body {
  - font-family: "Source Sans Pro", Helvetica, sans-serif';
  + font-family: "Source Sans Pro", Helvetica, sans-serif;
  font-size: 16px;
  color: ${props.content ? 'black' : '#999'};
  background-color: transparent !important;
  