Changes:
- Added a new page: /integrations
- Added the page to `config/policies.js`, `config/routes.js`, and
`assets/styles/importer.less`
- Added a link to the page to the "Platform" navigation dropdown.
This PR will be ready for review when:
- [ ] The meta description (in routes.js) is approved
- [ ] The text that replaces the lorum ipsum in the wireframes has been
approved.
