update API docs

[jdebacker]

This PR fixes issue where the API sections are listed twice in the Jupyter Book (see the left sidebar here). This was a result of some changes in the more recent JB releases.

[andersonfrailey]

Now that #181 is merged, these test failures should go away when you merge this with the master branch.

[jdebacker]

@andersonfrailey Can you try rerunning the checks here? It looks like there was just a timeout when installing some packages.

[codecov-commenter]

Codecov Report

Merging #186 (181bed6) into master (180063a) will decrease coverage by 0.19%. The diff coverage is 80.53%.

@@            Coverage Diff             @@
##           master     #186      +/-   ##
==========================================
- Coverage   82.15%   81.96%   -0.20%     
==========================================
  Files          21       21              
  Lines        1547     1647     +100     
==========================================
+ Hits         1271     1350      +79     
- Misses        276      297      +21     

Flag	Coverage Δ
unittests	81.96% <80.53%> (-0.20%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
taxbrain/report.py	86.92% <44.44%> (-3.33%)	:arrow_down:
taxbrain/taxbrain.py	89.41% <82.10%> (-3.37%)	:arrow_down:
taxbrain/tests/test_brain.py	94.25% <100.00%> (+0.50%)	:arrow_up:
taxbrain/utils.py	92.89% <100.00%> (+0.03%)	:arrow_up:

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[andersonfrailey]

Thanks for working on this, @jdebacker! Anything else you want to add before I merge?

[jdebacker]

Nope - this is ready - thanks!