[aschokking]

The curriculum overview mixed the student path in with reference material, so it wasn't clear where to start. This makes it a landing page:

• Top: a short intro, then Step 1: Setup and Step 2: Challenges, numbered and in order, with a pointer from the end of Setup to the first challenge.
• Bottom, under Reference: the Java track, robot/tooling background, in-season onboarding, and AI tools, with a note that you don't need these up front.

Other changes:

• Providers & Factories and Dependency Injection keep their place in the challenge order but are marked Reading.
• The "learn classes before the Auto-stopping Collector" note is now a tip next to that challenge.
• Added the Command Groups reference page, which was in the sidebar but missing from the overview.
• Dropped the Practice Repo clone block at the bottom, because it contradicted Environment Setup (fork, not clone).

docs:build passes, with no dead links.

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