Add "Analysis" page

[danielmwatkins]

The page should have examples of each analysis step:

• velocity
• acceleration
• strain rates
• dispersion

with figures and a list of options.

[danielmwatkins]

Adding math to the doc files: https://sphinx-rtd-trial.readthedocs.io/en/latest/ext/math.html

[danielmwatkins]

Implement auto doc so that the doc strings from the functions get copied into the website: https://sphinx-rtd-trial.readthedocs.io/en/latest/ext/autodoc.html#module-sphinx.ext.autodoc