adityatandon15/low-level-design-course ? reverse-engineered prompt

Build me a clean learning hub for this low level design course, with one place to browse all the lectures, practice problems, and notes in an easy way.

I want it to feel simple for someone following the Coder Army playlist, so each lecture should be easy to find and open, and the code examples should be organized clearly with short descriptions of what each one teaches. Please keep the focus on the Java examples in the repo, and make the layout nice enough that someone can jump between lectures without getting lost.

If anything is unclear from the current files, use the existing folder names and content as the source of truth, and look up current docs online if you need to. I care most about making the whole thing easy to read, easy to navigate, and useful for learning system design concepts step by step.