fix(links): correct dead links on various pages

Related to CAM-1345
chore(docpad-plugin-links): upgrade to v2.8.2

Upgrade docpad-plugin-links to latest (v2.8.2) version and update
configuration accordingly.

This adds a number features such as better reporting, failOnError via
CI build and ZERO dead links to our docs project.

Happy docking!

Closes CAM-1345