upgrade structures and migrate to nextra v4

content/about.md

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+# About
+
+This is a static server for me to share my notes with you guys.
+
+## Acknowledgement
+
+This page is built with [Nextra](https://nextra.site/).
+
+With the front end framework [Next.js](https://nextjs.org/)
+
+CI-CD is maintained via [Jenkins](https://www.jenkins.io/) with [Docker](https://www.docker.com/).
+
+With deployment support from [Vercel](https://vercel.com/) and [Cloudflare](https://www.cloudflare.com/)
+
+Data is stored on [GitHub](https://github.com/)
+
+Course materials are collected from [Washington University in St. Louis](https://wustl.edu/)
+
+Also the procrastination of project [Notechondria](https://github.com/Trance-0/Notechondria)
+
+And also [Fulwing](https://github.com/Fulwing/WashUdoc)
+
+Coding is done via the best editor so far [Cursor](https://www.cursor.com/)
+
+The icon is from [Bootstrap Icons](https://icons.getbootstrap.com/)