Update docs

[sarahmish]

Update docs theme and fix some docstrings.

[codecov-io]

Codecov Report

Merging #145 (21af46b) into master (094aac3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   42.30%   42.30%           
=======================================
  Files          24       24           
  Lines        1794     1794           
=======================================
  Hits          759      759           
  Misses       1035     1035           

Impacted Files	Coverage Δ
orion/benchmark.py	69.94% <ø> (ø)
orion/db/explorer.py	0.00% <ø> (ø)
orion/functional.py	100.00% <ø> (ø)

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