Simplify env var parsing

Author: fnesveda

apify-docs-theme/src/config.js

@@ -10,10 +10,7 @@ if (process.env.LOCALHOST) {
     absoluteUrl = process.env.APIFY_DOCS_ABSOLUTE_URL;
 }
 
-let noIndex = false;
-if (process.env.NO_INDEX) {
-    noIndex = [true, 'true', 1, '1'].includes(process.env.NO_INDEX);
-}
+const noIndex = ['true', '1'].includes(process.env.NO_INDEX ?? '')
 
 const themeConfig = {
     docs: {