Add more info about HydroShare to the landing page

[danames]

• Add a link to hydroshare, add external links to a few key research articles about hydroshare - https://scholar.google.com/scholar?hl=en&as_sdt=0%2C45&q=hydroshare+ames&btnG=#d=gs_cit&u=%2Fscholar%3Fq%3Dinfo%3Avi_pCp9klcAJ%3Ascholar.google.com%2F%26output%3Dcite%26scirp%3D0%26hl%3Den
• Add a screen capture of hydroshare (shrunk to fit - when they click it have it open the actual hydroshare in a new window)
• Add "What is the hs_restclient python API? Include links to find the api on github and also any other documentation you can find about it.
• include an architectural diagram showing how the hs_restclient fits in with the hydroshare architecture. I'm sure you can find this picture somewhere already made.

[danames]

specifically I want a simple diagram showing how hydroshare is in one box with data, tethys is in another box with user functionality and the rest client is inbetween...