Small site improvements

I have made a few more improvements to the website to make sure the user experience is as good as it can be. The improvements were the following:

• Increased the spacing between lines (line-height or leading). I was using the default spacing which made each line too close to each other and the text harder to read. It is a very small change but should improve the readability.
• Expanded the footer. This is something I wanted to do for quite some time as the previous footer design was not flexible enough to fit more links. The footer finally includes a link to our YouTube channel. On larger screens I also added an illustration to make it feel like the bottom of the sea.
• Small improvements to make the site slighly faster.