We are using jekyll to generate the try matrix now page and the project pages.
The sources for these pages are in the jekyll/_posts/projects directory. Feel free to send us a PR to add or update a project entry. You can start with the template, and you can upload a thumbnail and/or a main picture to the images subfolder - these will be accessible from https://matrix.org/docs/projects/images/
Jekyll requires a date in the project filename; we use the date to sort the various project lists (oldest projects first). Please submit new entries with the starting date of the project.