netlify: Add some security headers
netlify: Add some security headers

mdhender/hugo,anthonyfok/hugo,digitalcraftsman/hugo,fedelibre/hugo,mitchchn/hugo,fedelibre/hugo,digitalcraftsman/hugo,fedelibre/hugo,anthonyfok/hugo,mdhender/hugo,mitchchn/hugo,mdhender/hugo,fedelibre/hugo,gohugoio/hugo,gohugoio/hugo,gohugoio/hugo,anthonyfok/hugo,mdhender/hugo