Attempt to Improve core concepts / Formatting Sections

[dylangrandmont]

What change does this PR introduce and why?

Trying a few tweaks to our introductory docs:

• Remove references which were intended for audiences migrating from workflows -> datasets
• Shorten content of these pages for greater clarity

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.93%. Comparing base (c4eafa7) to head (33701ee).
Report is 1 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #576      +/-   ##
==========================================
- Coverage   94.81%   93.93%   -0.89%     
==========================================
  Files          83       83              
  Lines        5190     5190              
  Branches      736      736              
==========================================
- Hits         4921     4875      -46     
- Misses        194      234      +40     
- Partials       75       81       +6     

Flag	Coverage Δ
integration	75.93% <ø> (ø)

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