Markdown Refinements & Installation Streamlining for a Smooth User Journey

[ystoneman]

What does this PR do?

I had issues following the notebook until I realized I wasn't using the write SageMaker image and I did the pip install of the requirements.txt too late in the process.

While I was at it, I edited the other explanations in the markdown, some error handling towards the beginning, and changed !pip install to %pip install because this seems to be the recommended approach.

@philschmid

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[ystoneman]

Hey Phil -- apologies for the complexity. Yeah, it's mainly just to prevent others from running into the same issue in SageMaker Studio Notebooks that I ran into. (Studio Notebooks is recommended in the blog post.)

I refined some grammar, etc while I was at it.