Big data workflow

[emercado4]

Pre-merge request checklist (to be completed by the one making the request):

• [x] I have performed a full review of this code myself.
  • For Python code in PySpark specific sections, all code should have been run in Jupyter notebooks.
  • For code in sections of the book containing both Python and R code, the page of the book should be constructed as described in the contributing guide and converted to a markdown file.
• [x] I have formatted the outputs of code blocks correctly (to match other outputs in the book and in line with the style guide [coming soon])
• [x] I have built the book as outlined in the contributing guide and confirmed that any additional/modified content is displaying as expected.

Details of this request:

• Add a page of summary guidance/tips on working with big data to the front of the Spark Analysis section of the book

Things to note about this request:

• The aim of the page is to be general enough to be useful to all users
• Will also be linked to in CDP billing pages so users can start thinking about how to keep compute costs as low as possible

Requirements for review:

Content:

• [ ] Content makes sense and is accurate
• [ ] Best practice learned from case studies has been incorporated
• [ ] Content is clear
• [ ] No important information is missing
• [ ] No typos

Formatting:

• [ ] Page is formatted properly and displays correctly when building the book
• [ ] Formatting is consistent with the rest of the book
• [ ] Links work correctly
• [ ] Figures display correctly and are clear/accurate
• [ ] Page is added to correct place in TOC

[emercado4]

Thanks Nathan! I'll go ahead and merge this in.