57 million tons is equal to 114 billion pounds. According to this Wikipedia page the average adult in North American weighs 180lbs.
114,000,000,000 lbs / 180 lbs/person = 633,333,333 people
So it’s an amount of plastic that weighs as much as 633 million people; of course it is still impossible to really imagine how much plastic that is. But maybe a better reference then the volume a park.
It depends on how fancy of a website you are trying to make. But check out something like Hugo or Jekyll. I haven’t used Jekyll personally but have used Hugo. There are plenty of templates to get you started depending the type of content you are planning on putting up.
And the best part is you can host the site for free on GitHub or Gitlab, so the domain name is the only cost.