Docs

adds a docs folder with a decently well setup sphinx config.

notebooks can be incorporated into this sphinx since it has the package (and requirement) of nbsphinx.

added 11 commits

• 7de4e5dc...1b39c15a - 10 commits from branch gwinc:master
• d653d81d - Merge branch 'master' of git.ligo.org:gwinc/pygwinc into docs

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merged