Add recommended security related headers to website (#98)

Signed-off-by: Vihang Mehta <vihang@pixielabs.ai>

Author: vihangm

netlify.toml

@@ -2,6 +2,15 @@
   publish ="public/"
   command = "yarn install && yarn lint && gatsby build"
 
+[[headers]]
+  for = "/*"
+  [headers.values]
+    Permissions-Policy = "camera=(), gyroscope=(), magnetometer=(), microphone=(), midi=(), payment=(), vibrate=()"
+    Referrer-Policy = "strict-origin-when-cross-origin"
+    X-Content-Type-Options = "nosniff"
+    X-Frame-Options = "SAMEORIGIN"
+    X-XSS-Protection = "1; mode=block"
+
 [[redirects]]
   from = "/blog"
   to = "https://blog.px.dev"