Add:
    static/js/index.js
        -Fix #23.
        -Move callbacks to an function that gets executed on definition, for
        more aesthetically modular code.

Rem:
    static/js/lib/typeahead.bundle.min.js
        -Remove the `typeahead` plugin, which is not longer used for
        autocompletion.

Add:
    static/(css, js)/lib
        -Add directories to contain third-party library files (eg,
        `jquery.min.js`).

    templates/index.html, static/js/index.js
        -Move `typeahead` initialization from `index.html` to `index.js`.

    static/sass/index.sass
        -Refactor `twitter-typeahead` specifier hierarchy.