Pepper&Carrot website: setup a SSL secure

Did you saw the new little green padlock on the address bar of your web-browser? It's because I decided to invest time into increasing the security of the Pepper&Carrot website. With this protocol, I'm sure that your browsing experience is both safe and reliable on Pepper&Carrot now.

"Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), both frequently referred to as "SSL", are cryptographic protocols that provide communications security over a computer network. [...] The Transport Layer Security protocol aims primarily to provide privacy and data integrity between two communicating computer applications." - Wikipedia. Thank you to the team of contributors on the IRC channel for the quick test this morning.
If you find more issues, let me know in the comments.