Add initial site content

_includes/head/custom.html

@@ -2,4 +2,14 @@
 
 <!-- insert favicons. use http://realfavicongenerator.net/ -->
 
-<!-- end custom head snippets -->
+<!-- support for buttons.github.io -->
+<script async defer src="https://buttons.github.io/buttons.js"></script>
+
+<style type="text/css">
+  /* override mmistakes image highlighting */
+  .archive__item:hover .archive__item-teaser {
+    box-shadow: none;
+  }
+</style>
+
+<!-- end custom head snippets -->