Implement a Search and Highlight function for the graph

[johannesduesing]

Problem
Currently, there is no way to automatically search for a specific node in the graph. This makes it basically impossible for other researchers to identify whether their work is part of the dataset or not.

Solution
Implement a search functionality for the graph view. It would be interesting to search for attributes like DOI, Author name or Title. Matching nodes should be highlighted in the graph, so users can quickly identify incoming and outgoing edges.