The bibliography filename `papers.bib` is hard coded in templates, and
the equivalent setting in `_config.yml` is not used anywhere. So
changing the bib filename in `_config.yml` won't have any effects.
This PR replaces hard-coded filenames with the value from `_config.yml`.
fixes#993
Also added links to news and publications from respective section
headers on the home page. Changed the colors of the header links to make
it consistent with the previous look.
Yue Gao
Rohan Deb Sarkar
José M. Requena Plens
Maruan