Merge pull request #60 from hcorson-dosch-usgs/switch_twitter_card_type

switch to summary card

Author: hcorson-dosch-usgs

public/index.html

@@ -39,7 +39,7 @@
     <meta property="og:description" content="">
     <meta property="og:image" content="https://labs.waterdata.usgs.gov/visualizations/images/what-is-drought.png">
     <!-- Twitter -->
-    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:card" content="summary">
     <meta name="twitter:url" content="https://labs-beta.waterdata.usgs.gov/visualizations/what-is-drought/index.html#/">
     <meta name="twitter:title" content="What is streamflow drought?">
     <meta name="twitter:description" content="">