Strict Transport Security (HSTS) and HSTS Preloading

Provide support for Strict Transport Security (HSTS) and HSTS Preloading with a large max-age to improve security of Furry Network. This will help prevent against downgrade attacks against the site as well as break ssl stripping. This will become more important as time moves on, but implementing a higher level of security helps Furry Network stand out among furry sites. This will also help mitigate cookie injection attacks