feat: add Kelvin White (L3thal) to peoplelist.json
The commit adds new images and information for Kelvin White (L3thal) to the `people/kelvinwhite.json` file. It includes details such as his full name, handle, birth and death dates, affiliations, and contributions. The commit also adds Kelvin White (L3thal) to the `peoplelist.json` file, ensuring he is included in the list of people.