Update Readme and Docs

[KEggensperger]

Some ideas on how to improve the readme and docs:

• [Readme] Add pipeline image
• [Readme] Make publications bibtext entries that can be easily copied
• [Readme] Add further publications / blog posts
• [Docs] Add a really short and simple explanation on how auto-sklearn works
• [Docs] Add section on universities/companies/success stories using auto-sklearn
• [Docs] Add button to easily add more universities/companies/success stories