Add a page to secutils.dev/docs with resources useful to application security engineers

[azasypkin]

Summary

It'd be useful to have a page with resources (e.g. https://owasp.org or https://opensecurityarchitecture.org), podcasts (e.g. https://www.youtube.com/@ApplicationSecurityPodcast or https://opensourcesecurity.io), books etc. that might be useful to application security engineers.