updated docs to sphinx for use with ReadTheDocs

[irvanjitsingh]

Merged the documentation found in the gurbanidb and docs readmes into one sphinx document (with all of the required build files included). Sphinx was chosen because it is very easy to then import into a hosted documentation solution such as readthedocs.

[jujhars13]

sphinx sound like a good idea to me.

[jasdeepkhalsa]

Great idea Irvanjit ! The documentation is looking much better. Merging your pull request now.