Add analytics section to the appendix

[arafatiqbal]

#132 Adds the analytics markdown from ember-cli to the appendix. I added the intro paragraph, and added an additional sentence to the "Who has access" section. Other than that, it's the same thing as that link.

To do form the issue:

• [x] Add a new page to the Appendix called Analytics
• [x] Be sure to include the new page name in pages.yml
• [x] Include the content from the page D3AH linked to
• [x] Write an introduction explaining what these are and when to use them

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