Nova is the successor of my favorite web editor Coda. It's currently still in beta, but I already use it everyday. It's even more extensible with many kinds of different plug-ins than Coda was. One way in which both can be extended are custom themes. I already created my own personal theme for Coda, but sadly it doesn't just work in Nova, because of the big changes under the hood. So I modified it for Nova. It's still called Northsea like the Coda theme, but there are a few small changes. You can download it from the Extension Library inside of Nova or here if you like.
When you design a website, it's difficult to estimate how good the performance and security really is. You can visit your website over a slow connection to get a general feeling for its speed, but this is just one other data point and doesn't really tell you the reasons. The lock in the browser address field shows how the connection to your website is encrypted with SSL, but not much more about the security. A great tool for such cases are website speed and security tests. These tests don't just measure the loading time of your website or used SSL certificates, but also analyse the structure and content of your website to give you hints how to improve it.
You don't need a perfect score in every test for your website to be perfect. There are always things only your hosting provider has control over or necessary tradeoffs specific to your website, which will prevent you from getting the best score. Still, you should aim to get a high a score as possible and repeat the tests at least once every year, because the technologies behind your website and possible attack scenarios are constantly evolving.
Here are some great free tests I recommend to you:
"The situation, sadly, is that we now have two separate fields: There’s worldwide audiovisual entertainment, and there’s cinema. They still overlap from time to time, but that’s becoming increasingly rare."