Refactor stats section for organization redesign - 4

[mcbouslog]

Staging branch URL: https://pr-5577.pfe-preview.zooniverse.org

Helpful links:

• staging testing project: https://pr-5577.pfe-preview.zooniverse.org/organizations/markb-panoptes/urban-wildlife-org-test
• Snapshot Serengeti: https://pr-5577.pfe-preview.zooniverse.org/organizations/meredithspalmer/snapshot-safari?env=production
• Notes from Nature: https://pr-5577.pfe-preview.zooniverse.org/organizations/md68135/notes-from-nature?env=production

Describe your changes.

• refactor org landing stats section in accordance with InVision organization landing page redesign
• clean-up styling for mobile, headings and misc.

Required Manual Testing

• Does the non-logged in home page render correctly?
• Does the logged in home page render correctly?
• Does the projects page render correctly?
• Can you load project home pages?
• Can you load the classification page?
• Can you submit a classification?
• Does talk load correctly?
• Can you post a talk comment?

Review Checklist

• Does it work in all major browsers: Firefox, Chrome, Edge, Safari?
• Does it work on mobile?
• Can you rm -rf node_modules/ && npm install and app works as expected?
• If the component is in coffeescript, is it converted to ES6? Is it free of eslint errors? Is the conversion its own commit?
• Are the tests passing locally and on Travis?

Optional

• Have you replaced any ChangeListener or PromiseRenderer components with code that updates component state?
• If changes are made to the classifier, does the dev classifier still work?
• Have you resized and compressed any image you've added?
• Have you added in flow type annotations?
• Have you followed the Springer guidelines for commit messages?

[coveralls]

Coverage increased (+0.003%) to 49.252% when pulling 40a08fd on org-stats-section into 1299c84 on org-redesign.

[mcbouslog]

This has been rebased, ready for review.