revise intro

[dougbrn]

Revises the intro section to provide a more helpful initial description and content guide. Resolves #80

[github-actions]

Before [b3b4d99]	After [8e1fc67]	Ratio	Benchmark (Parameter)
33.4±1ms	34.0±3ms	1.02	benchmarks.AssignSingleDfToNestedSeries.time_run
8.85±0.04ms	9.07±0.1ms	1.02	benchmarks.NestedFrameAddNested.time_run
86M	86.1M	1	benchmarks.NestedFrameAddNested.peakmem_run
89.4M	89.4M	1	benchmarks.NestedFrameQuery.peakmem_run
6.42±0.07ms	6.45±0.09ms	1	benchmarks.NestedFrameQuery.time_run
89.4M	89.4M	1	benchmarks.NestedFrameReduce.peakmem_run
5.22±0.05ms	5.15±0.06ms	0.99	benchmarks.NestedFrameReduce.time_run
262M	257M	0.98	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
275M	271M	0.98	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
60.8±3ms	59.6±2ms	0.98	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.65%. Comparing base (b3b4d99) to head (9871e56).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   98.65%   98.65%           
=======================================
  Files          15       15           
  Lines         818      818           
=======================================
  Hits          807      807           
  Misses         11       11           

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[hombit]

Thanks!