Minor docs cleanups for TAPE

[wilsonbb]

A series of minor docs cleanups addressing small changes proposed in #372

The following changes are made:

• When loading a time series object in what was formerly this section, add a sentence such as ``Note that this loads the data from all available bands’’
• Changed Installing in the Quickstart to be an executable shell command to pip install TAPE
• Demonstrate setting a random seed in Ensemble.smaple
• Improves the plot in in From the ensemble

• My PR includes a link to the issue that I am addressing

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Before [19ff5ad]	After [7292fe7]	Ratio	Benchmark (Parameter)
34.1±0.3ms	34.7±0.6ms	1.02	benchmarks.time_prune_sync_workflow
33.1±0.3ms	33.5±0.6ms	1.01	benchmarks.time_batch

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.77%. Comparing base (19ff5ad) to head (bad18b6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #414   +/-   ##
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  Coverage   95.77%   95.77%           
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  Files          25       25           
  Lines        1751     1751           
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  Hits         1677     1677           
  Misses         74       74           

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[dougbrn]

Can we have this be %pip install lf-tape

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[dougbrn]

Some small suggestions, but overall this looks good!