- Add a README
- Move non-dynesty examples into separate sub-directory to avoid
repeatition
- Standardize variable names
- Remove the multidimensional gaussian: the 15d example is better and
more complete
- Remove the start_mcmc_chains_near.. example: this is demonstrating a
rarely used feature of a rarely used sampler, better to put this into
the docs if needed.

?

Previously I was setting the noise_log_likelihood to nan in a confusing
way. This removes that and also renames all the liklihoods for clarity.