Doc fixes

[wtbarnes]

Fixes #127 Fixes #40 Fixes #138 Fixes #72 Fixes #73 Fixes #77

This updates all of the docstrings and other documentation to be consistent with sphinx and RTD. It also refactors how the configuration tables are represented in the docs and moves all of the example code to a gallery.

TODO

• [x] Get gallery examples actually working
• [x] Show off visualization capabilities in gallery
• [x] Make sure sample config actually works
• [x] Make another pass on API docs/docstrings
• [x] Fix #136
• [ ] Squash merge this PR

[codecov[bot]]

Codecov Report

Merging #144 (2cd0d34) into master (4e04e61) will decrease coverage by 2.40%. The diff coverage is 26.86%.

@@            Coverage Diff             @@
##           master     #144      +/-   ##
==========================================
- Coverage   65.44%   63.04%   -2.41%     
==========================================
  Files          10       11       +1     
  Lines         657      690      +33     
==========================================
+ Hits          430      435       +5     
- Misses        227      255      +28     

Impacted Files	Coverage Δ
pydrad/configure/configure.py	78.48% <ø> (ø)
pydrad/configure/data/__init__.py	0.00% <0.00%> (ø)
pydrad/visualize/animate.py	20.00% <ø> (ø)
pydrad/visualize/plot.py	15.30% <5.00%> (-0.43%)	:arrow_down:
pydrad/configure/util.py	57.89% <33.33%> (-8.78%)	:arrow_down:
pydrad/parse/parse.py	71.08% <50.00%> (-0.97%)	:arrow_down:

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