Add concept_slugs to five stages

[andy1li]

Context:

https://backend.codecrafters.io/admin/site_feedback_submissions/0a7be113-b98c-4311-9243-6ed501d14039/edit

The user suggested for the first stage:

A comment above each invocation of each function would be useful and clear on what is happening.

Links to concepts might be more effective than comments.

---

Note

Adds concept_slugs arrays to stages vi6, nv3, wa6, nh4, and sk0 in course-definition.yml.

• Course config (course-definition.yml):
  • Add concept_slugs to stages:
    • vi6 (Bind to a port)
    • nv3 (Send Correlation ID)
    • wa6 (Parse Correlation ID)
    • nh4 (Serial requests)
    • sk0 (Concurrent requests)
  • Concepts referenced: network-protocols, tcp-overview, go-tcp-server, rust-tcp-server, python-tcp-server, java-tcp-server, cpp-tcp-server.

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