Remove our categorization hack, and add category view pages instead.

_sass/_columns.scss

@@ -0,0 +1,25 @@
+/* For dynamically determined columnar formatting.
+   Currently supports equal-width, 1-4 column layouts.
+*/
+
+* {
+  box-sizing: border-box;
+}
+
+.column {
+  float: left;
+  padding-right: 5px;
+}
+
+.col-1 {
+  width: 100%;
+}
+.col-2 {
+  width: 50%;
+}
+.col-3 {
+  width: 33%;
+}
+.col-4 {
+  width: 25%;
+}