SE-2580 Onboarding rework: Address common gotchas

• fa8a7016 Addresses https://gitlab.com/opencraft/documentation/private/-/issues/295
• 66b6a70d Addresses comments on !166 (merged).

Testing instructions

1. Read the text and check links for clarity and correctness.
2. Ensure the referenced issue is sufficiently addressed.

Reviewer

• @rusrushal13