doc: add Node.js Security Best Practices

Co-authored-by: Ulises Gascon <UlisesGascon@users.noreply.github.com>
Co-authored-by: Thomas Gentilhomme <gentilhomme.thomas@gmail.com>
Co-authored-by: Facundo Tuesca <facundo.tuesca@trailofbits.com>
Co-authored-by: Michael Dawson <midawson@redhat.com>
Co-authored-by: Andrew Hart
Co-authored-by: Zbyszek Tenerowicz <naugtur@gmail.com>
Co-authored-by: Yagiz Nizipli <yagiz@nizipli.com>

Author: 7 people

locale/en/docs/guides/index.md

@@ -14,6 +14,7 @@ layout: docs.hbs
 * [Dockerizing a Node.js web app](/en/docs/guides/nodejs-docker-webapp/)
 * [Migrating to safe Buffer constructors](/en/docs/guides/buffer-constructor-deprecation/)
 * [Diagnostics - User Journey](/en/docs/guides/diagnostics/)
+* [Security Best Practices](/en/docs/guides/security/)
 
 ## Node.js core concepts