try custom headers

custom-headers/_previewHeaders

@@ -0,0 +1,18 @@
+/*
+  X-Frame-Options: SAMEORIGIN
+  X-XSS-Protection: 0
+  X-Content-Type-Options: nosniff
+  Content-Security-Policy: frame-src 'self' app.netlify.com *.demo.questdb.io *.questdb.io www.youtube.com www.slideshare.net forms.hsforms.com;
+
+/docs/*
+  Location: /:splat
+  Status: 200
+
+/static/*
+  Cache-Control: public, max-age=31536000, immutable
+
+*.js
+  Cache-Control: public, max-age=31536000, immutable
+
+*.css
+  Cache-Control: public, max-age=31536000, immutable 

custom-headers/_productionHeaders

@@ -0,0 +1,14 @@
+/*
+  X-Frame-Options: SAMEORIGIN
+  X-XSS-Protection: 0
+  X-Content-Type-Options: nosniff
+  Content-Security-Policy: frame-src 'self' app.netlify.com *.demo.questdb.io *.questdb.io www.youtube.com www.slideshare.net forms.hsforms.com;
+
+/static/*
+  Cache-Control: public, max-age=31536000, immutable
+
+*.js
+  Cache-Control: public, max-age=31536000, immutable
+
+*.css
+  Cache-Control: public, max-age=31536000, immutable 

netlify.toml

@@ -665,3 +665,9 @@ to = "/:splat"
 status = 200
 force = true
 conditions = {Context = "deploy-preview"}
+
+[context.production]
+command = "npm run build && cp ./custom-headers/_productionHeaders ./build/_headers"
+
+[context.deploy-preview]
+command = "npm run build && cp ./custom-headers/_previewHeaders ./build/_headers"