FEATURE: Create a webpage for the project

[mpu-creare]

Should have auto-generated reference docs from docstrings as well as more user-friendly documentation for users, developers, and advocates

[mlshapiro]

docs are being served: https://creare-com.github.io/podpac-docs/

need to auto generate using gist here: https://gist.github.com/domenic/ec8b0fc8ab45f39403dd

[mlshapiro]

todo:

• automate build on commit using travis
• implement and demo numpy autodoc
• tighten up current documentation copy
• add branding
• fix image in design
• implement doctests
• implement doc versions

[mlshapiro]

• numpy reference: https://github.com/numpy/numpy/blob/master/doc/source
• xarray reference: https://github.com/pydata/xarray/tree/master/doc

[mlshapiro]

we have not implemented a versioning system for the docs yet, but that doesn't yet feel necessary, we can put an issue on the board for later to address maintaining document versions.

Otherwise this is implemented at first pass.