Adds link to github page for dependency in UI.

[jonnynabors]

Adds fontawesome to resources.

This is what a configuration for a dependency would look like to add this to the page.

links:
  - rel: github
     href: https://github.com/spring-projects/spring-boot/tree/master/spring-boot-project/spring-boot-starters/spring-boot-starter-web
     description: Building a RESTful Web Service

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[snicoll]

Thanks for the PR @jonnynabors - We meant to investigate another route for links from the Web UI, see #371

Paging @bclozel for additional feedback.

[jonnynabors]

I've rebased this on top of the changes from the Spring Boot 2 update.

[snicoll]

Thanks a lot @jonnynabors but we've decided not to add links to the UI itself as we've indicated in #353