Adds find articles guide to home and databases pages

Closes #663 

* Based on JIRA ticket SW-1130 spec, moved xSearch to bottom of the list

@jvine Please let me know if there are changes to 'Find articles' placement and text 

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![image](https://cloud.githubusercontent.com/assets/302258/4164077/e5817dde-34ef-11e4-82b0-2233ba4179c4.png)