Version 1.2.0

Core changes

• Add security headers in webpack: #93
• Add turboMode to webpack: #93
• Add progressive web app in production mode: #94
• Change React to Preact in production: #94
• Update packages to @latest: #93
• Fix next/image in header component: #104
• Add next/script instead of default <script />: #95
• Add dns-prefetch to all external URLs: #96
• Fix sitemap styling: #97
• Add SWR to sitemap page: #97
• Load favicons from own server: #94
• Removed preload for Inter-Italic.var.woff2: #107

Documentation changes

• Changed environment variable for placeholder: #104