Render documentation using Sphinx

[christopher-henderson]

Addresses #5

[codecov-io]

Codecov Report

Merging #12 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #12   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          556       578   +22     
  Branches        69        72    +3     
=========================================
+ Hits           556       578   +22     

Impacted Files	Coverage Δ
pstream/_async/async_stream.py	100.00% <100.00%> (ø)
pstream/_async/functors.py	100.00% <100.00%> (ø)
pstream/_sync/stream.py	100.00% <100.00%> (ø)
pstream/errors.py	100.00% <100.00%> (ø)

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