Adds This American Life icon (#488)

Co-authored-by: Terence Eden <edent@users.noreply.github.com>

images/reference/index.md

@@ -261,4 +261,5 @@ Where possible this links to the organisation's brand guidelines page.
 | <img src="/images/svg/element.svg" width="256" /> | <img src="/images/reference/element.svg" width="256" /> | https://element.io/images/logo-mark-primary.svg |
 | <img src="/images/svg/keskonfai.svg" width="256" /> | <img src="/images/reference/keskonfai.svg" width="256" /> | https://www.keskonfai.fr/ |
 | <img src="/images/svg/jacobin.svg" width="256" /> | <img src="/images/reference/jacobin.svg" width="256" /> | https://www.jacobinmag.com/contact |
-| <img src="/images/svg/cplusplus.svg" width="256" /> | <img src="/images/reference/cplusplus.svg" width="256" /> | https://isocpp.org/home/terms-of-use |
+| <img src="/images/svg/thisamericanlife.svg" width="256" /> | <img src="/images/reference/thisamericanlife.png" width="256" /> | https://www.npr.org/about-npr/179876898/terms-of-use |
+| <img src="/images/svg/cplusplus.svg" width="256" /> | <img src="/images/reference/cplusplus.svg" width="256" /> | https://isocpp.org/home/terms-of-use |

images/svg/thisamericanlife.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="This American Life" role="img"
+viewBox="0 0 512 512"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><g fill="#ed0017"><rect x="90" y="170" width="117" height="98"/><rect x="247.7" y="170" width="175.3" height="29.25" /><rect x="247.7" y="239" width="175.3" height="29.25" /><rect x="90" y="307" width="333" height="29.25" /><polygon points="208,335.6 208,420.4 278.5,335.6"/></g></svg>