Revert to static JS site (Svelte built, but no CSR); Optimize images

scripts/critical-css.js

@@ -22,8 +22,10 @@ function getFiles(dir, ext, files = []) {
 const beasties = new Beasties({
 	path: buildDir,
 	preload: 'default',
-	logLevel: 'warn'
-});
+	logLevel: 'warn',
+	inlineThreshold: 50 * 1024,   // inline any stylesheet < 50KB
+	minimumExternalSize: 50 * 1024 // inline any leftover < 50KB
+  });
 
 async function main() {
 	const htmlFiles = getFiles(buildDir, '.html');