added app settings links
added tracing to linklint
better link linting
corrected template link
Create a feedback modal and refactor structure

Closes #392
Merge pull request #430 from sendgrid/app-locations

added app settings links
Merge pull request #436 from sendgrid/feedback

Create a feedback modal and refactor structure
styling fixes

- closes #437 (mea culpa)
- hides marketing pixels causing styling breakage (FU!)
added more specifity to feedback
Merge pull request #438 from sendgrid/develop

moar deploys