Linking Project, Contributor and Contribution

[ZibanPirate]

Description

we currently have three listing pages, /projects /contributions /team (Contributors).

We want to have detail pages for each

Check List

1. /projects/:project feat: Project detail page #605 Feat: categorize projects #627
2. /contributions/:contribution Feat: contribution page #621
3. /team/:contributor feat: contributor page #610 feat: sitemap for contributors pages #614