add repos associated with papers to research page

[nickreich]

This involves going through repos associated with work that we have done recently and adding those repos to the associated header on the research page. E.g.

• https://github.com/aaronger/utility-eval-papers could be added to "Infectious disease forecasting"
• https://github.com/reichlab/covid-hosp-forecasts-with-cases could be added to "Infectious disease forecasting"
• there are others as well... that could be added based on looking at the publications page and seeing the github repos associated with published papers/preprints...

[nickreich]

Let's add https://github.com/reichlab/flusion to the "infectious disease forecasting" label