FEAT: Graph views

[Caussz]

Create the following graph views using publications and their autors and keywords:

• Node: keywords - it's size based on quantity & Edges: it's thickness based on the relationship between keywords (cited in the same publication)
• Node: authors - it's size based on their publications number & Edges: it's thickness based on the relationship between authors (publications in common)
• Node: research area - a different color for each area and their size corresponding to the number of publications & Edges: we need to discuss about this
  - [ ] In progress...