replace 404 link with working link for compat table

kangax compatibility table links to a 404 github page i think the correct page has moved to https://compat-table.github.io/compat-table/es2016plus/ <!-- 👋 Hi, thanks for sending a PR to LearningTypescript! 💖. Please fill out all fields below and make sure each item is true and [x] checked. Otherwise we may not be able to review your PR. --> ## PR Checklist - [ ] Addresses an existing open issue: fixes #000 - [ ] That issue was marked as [accepting prs](https://github.com/LearningTypeScript/site/issues?q=is%3Aopen+is%3Aissue+label%3A%22accepting+prs%22) - [ ] Steps in [CONTRIBUTING.md](https://github.com/LearningTypeScript/site/blob/main/.github/CONTRIBUTING.md) were taken ## Overview <!-- Description of what is changed and how the code change does that. -->