Redesign: replacing current project tiles with new ones from figma mockup

Currently project tiles require you click in to a modal, we've redesigned them with a call to action button and added a active tag.

Old:

New:

## Details:

* We will need a short description for each project. Let's be sure to check the description with the project.
* This might be a good time to check in to see which projects should be featured on the tiles.
* We might also want consider how many tiles we'd like on the page. Let's start with eight or less and go from there.
* "Read More" buttons should lead to project page.
* For example: the "read more" button for Choose Native Plants PA would lead you to https://codeforphilly.org/projects/pa_wildflower_selector
* Lets add direct links for github, and project website on each tile, similar to Hack for LA, and test it out on some users?

Comienza localizando el punto de entrada existente de project-tile y comparándolo con el mockup de Figma. Confirma las descripciones de los proyectos, la lista de proyectos destacados, el número de mosaicos, los destinos de Read More y los enlaces directos a GitHub y al sitio web del proyecto antes de implementar y probar los mosaicos rediseñados.

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