Add simple substring search

[cscarney]

167

[cscarney]

• [x] Need to move actual search logic to the database query rather than fetching every item from the database and checking them individually.
• [x] Need to support including content in the search
• [ ] Need to properly de-focus the search box when clicking article list/article view with a non-modal drawer (pageStack doesn't focus our pages on click because we have interactive: false)
• [ ] Clear the search box when the search page is closed
• [ ] Don't match markup, only text