Add About Section to docs

[dougbrn]

closes #206

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.81%. Comparing base (b6412b5) to head (6ad7e10).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #249   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files          14       14           
  Lines        1348     1348           
=======================================
  Hits         1332     1332           
  Misses         16       16           

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[github-actions]

Before [b6412b5]	After [72d9617]	Ratio	Benchmark (Parameter)
10.4±0.2ms	10.5±0.3ms	1.01	benchmarks.NestedFrameAddNested.time_run
11.1±0.06ms	11.2±0.2ms	1.01	benchmarks.NestedFrameQuery.time_run
274M	274M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
97.3M	97.1M	1	benchmarks.NestedFrameAddNested.peakmem_run
101M	102M	1	benchmarks.NestedFrameQuery.peakmem_run
101M	101M	1	benchmarks.NestedFrameReduce.peakmem_run
293M	293M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
25.5±0.7ms	25.1±0.5ms	0.98	benchmarks.AssignSingleDfToNestedSeries.time_run
49.8±2ms	48.9±7ms	0.98	benchmarks.ReassignHalfOfNestedSeries.time_run
1.32±0.01ms	1.26±0.01ms	0.96	benchmarks.NestedFrameReduce.time_run

Click here to view all benchmarks.