Add Sass processor

.eleventy.js

@@ -1,3 +1,10 @@
 module.exports = function (eleventyConfig) {
+  eleventyConfig.addPlugin(require('eleventy-sass'), {
+    postcss: require('postcss')([
+      require('postcss-preset-env'),
+      require('cssnano'),
+    ]),
+  })
+
   return {dir: {input: 'src', output: 'dist'}}
 }

.idea/watcherTasks.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectTasksOptions" suppressed-tasks="SCSS" />
+</project>