Font size, webp, aria-current, /now page and refactor

Made some tweaks to the font sizes so they’re a bit smaller on mobile, giving the site a more professional look.
Also cleaned up some CSS styles.
All the images on the photos page are now in webp format, and the responsive images have been improved. Still need to fix a few things related to screen DPI.
The current page is highlighted in the secondary navigation.
Added a /now page