NodeJs Inventory App: Clarify that link is raw code

[jwaddell10]

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

Describe your suggestion

In step 4 there is a link Download the file here that opens a page that contains raw code. I think it'd be helpful to clarify that this is not a typical website and it's just raw code, that way learners are aware and don't think it's a bug they need to fix.

Download the file here (note: this is just raw code, not a full website)

Path

Node / JS

Lesson Url

https://www.theodinproject.com/lessons/nodejs-inventory-application

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