Move blog into website/blog

Nest the blog work within the website directory.

website/blog/themes/tailwind/postcss.config.js

@@ -0,0 +1,14 @@
+const purgecss = require('@fullhuman/postcss-purgecss')({
+  content: ['./layouts/**/*.html'],
+  defaultExtractor: content => content.match(/[A-Za-z0-9-_:/]+/g) || []
+})
+
+module.exports = {
+  plugins: [
+    require('tailwindcss'),
+    require('autoprefixer'),
+    ...process.env.NODE_ENV === 'production'
+      ? [purgecss, require('cssnano')]
+      : []
+  ]
+}