Whole course: Remove all empty Additional Resource sections

[mao-sz]

Checks

• This is not a duplicate of an existing issue (please have a look through our open issues list to make sure)
• I have thoroughly read and understand The Odin Project Contributing Guide
• Would you like to work on this issue?

Describe your suggestion

Once #30386 is complete, all empty AR sections are to be removed.

Path

Node / JS, Ruby / Rails, Foundations

Lesson Url

N/A

(Optional) Discord Name

No response

(Optional) Additional Comments

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