Move attibutions to README, delete copyright page

Author: nghtctrl

README.md

@@ -1,3 +1,9 @@
 # [jihokim.com](https://jihokim.com)
 
-Welcome to the GitHub repository for my personal website. This website was designed and built by me using [Astro](https://astro.build/). Feel free to fork this repository for your own website.
+Welcome to the GitHub repository for my personal website. This website was designed and built by me using [Astro](https://astro.build/). Feel free to fork this repository.
+
+## Attribution
+
+Papers embedded in this website are licensed by their respective authors, publishers (e.g., ACM, IEEE), or repositories that provide open access (e.g., arXiv, OpenReview).
+
+Icons used on this website come from [Iconify](https://iconify.design/), a library of open source icons. All icons on Iconify are licensed by their respective open source licenses.