If you want to make any changes to the website, first fork the repository, make your changes to your forked version, and then submit a pull request.
To add a new person to the people page (/people.html), add a new entry to _data/people.yml.
The names should be sorted in alphabetical order by last name, regardless of their position.
To add a photo of yourself or another person, put the photo into assets/img and follow the filename pattern.
Then, add or update your entry in _data/people.yml to point to your new photo.
The photos are displayed at 170px by 170px.
See this pull request for an example.
To add a new person to the alumni page (/alumni.html), create a new entry in _data/alumni.yml.
The entries should be sorted by graduation year followed by last name.