use-cases: revise so they're more high level "landing pages"

[jorgeorpinel]

Use cases should have a different focus, so they are more high level and serve as landing pages – single web page that appears in response to clicking on a search engine optimized search result – leaving most details to the user guide. Some relevant quotes from #784 (comment):

This section should answer the question of an infrastructure, DevOps, MLOps folks on how DVC can help them. How can it be used, in what high level scenarios. (And it's even okay if they overlap in this case.)

To reiterate on the Use Cases vs User Guide:
Users Guide is like a car owner's manual - a lot of details, how tos, etc.
Use Cases would be like explaining how that car can be used (potentially referring a lot to the owner's manual to cover the technical details) - driving from home to work, renting, taxi, etc

Note: perhaps we could split this issue into 3. Not 4 because Data Registry is already written in this direction in #818.

Ideas:

• IN PROGRESS cases: generalized shared dev server #654 extract details from use cases and possibly other redundant docs (e.g. some tutorials) into blog posts user guide? - how-to: setup a shared cache (extracted from use cases) #2482

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Extracted to #2490:

• cases: extract how-to/tutorial parts into separate pages #1722 write use cases correctly and extract how-to/tutorials into separate pages
• IN PROGRESS? cases: DVC in Production #862 new case: DVC in Production (probably touch MLOps topics) - docs: use cases: add CI/CD for ML #2404
• SEO: individualized content previews for DVC pages (and maybe /doc pages) #857 Special content previews for SEO
• use-cases: use 'dvc cache dir' command in shared dev server #986 small shared dev server case update
• cases: training on a remote machine (SSH) #194 About ML on a remote machine
• case: deploying models for inference #2431 About specific ways to deploy ML models
• cases: Experiments #2270 About Experiment Management
• QUESTIONED best-practice: dataset partitioning and/or data compression? #682 new case about data partitioning and compression ?

  Use cases should have a different focus, so they are more high level and serve as landing pages – single web page that appears in response to clicking on a search engine optimized search result – leaving most details to the user guide.