Use in-browser markdown rendering for big text blocks.

Load MD text from server and render client side. Can we read straight from the GH repo?

Start by locating the client entry point and reviewing how large Markdown text blocks are currently loaded from the server. Clarify whether content should be read directly from the GitHub repository and define the browser-rendering flow. Done means the intended Markdown sources render correctly in the browser without requiring server-side rendering.

Written by the indexing model from the issue text.