Demo website change process [for Gabe]

This website was originally a pet project of Gabe, created with the hope of building intra-city community within the early civic tech scene. It's important that Gabe and future stakeholders know what's going on here, and how it's expected to work.

## To Do

- [x] Document website change process: https://github.com/CivicTechTO/codeacross.ca/blob/master/CONTRIBUTING.md
- [ ] Demo that change process (video call?)
- [ ] [optional] Post a recording of that process for others

cc: @gabesawhney

Comienza por CONTRIBUTING.md, donde se documenta el proceso de cambios del sitio web. Revisa los pasos documentados y utilízalos para preparar la demo solicitada; después confirma que el proceso se ha demostrado a Gabe y a las partes interesadas futuras. Según el issue, la grabación es opcional.

Escrito por el modelo de indexación a partir del texto del issue.