add script

script/content-migrations/remove-html-comments-from-index-files.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+
+const fs = require('fs')
+const path = require('path')
+const walk = require('walk-sync')
+const contentDir = path.join(process.cwd(), 'content')
+
+// remove legacy commented out conditionals in index.md files
+walk(contentDir, { includeBasePath: true, directories: false })
+  .filter(file => file.endsWith('index.md'))
+  .forEach(file => {
+    const newContents = fs.readFileSync(file, 'utf8')
+      .replace(/\n<!-- (if|endif) .*?-->/g, '')
+    fs.writeFileSync(file, newContents)
+  })