Main page update

[Avsecz]

Oli's feedback

• A comment re “model group”, which sounds a bit clunky. We could consider renaming “model group” -> model and use “model instance” for what we call currently “model”. The main kip web page as is really does look a bit confusing otherwise.

• “API” I would not say the Kiopi is an API in the first line of text. Sounds technical. The key is people can use models. How about
  “Kipoi is a repository of ready-to-use trained models fro regulatory genomics. Kipoi currently consist XX models (YY instances), covering canonical tasks in transcriptional and post-transcriptional gene regulation. Kipoi comes with a user-friendly python API (github.com/kipoi/kipoi), and it is also accessible via R or using the command line”