Update 14 files

- /index.rst
- /Past-Contrib/2013.rst
- /Past-Contrib/2023.rst
- /Past-Contrib/2022.rst
- /Past-Contrib/2021.rst
- /Past-Contrib/2020.rst
- /Past-Contrib/2019.rst
- /Past-Contrib/2018.rst
- /Past-Contrib/2017.rst
- /Past-Contrib/2016.rst
- /Past-Contrib/2015.rst
- /Past-Contrib/2014.rst
- /Past-Contrib/Sponsored_Proj.rst
- /Past-Contrib/index.rst