Add:
    templates/index.html, static/sass/index.sass
        -Add element tree for a sample input field.
        -Style input fields such that labels are aligned.
        -Add and style the `add-group` button.

Add:
    static/js/index.js
        -Add a `jQuery` callback to `fadeIn()` and `fadeOut()` the
        advanced-search form.

    templates/index.html, static/sass/index.sass
        -Add advanced-search form toggling button markup and styling.

Add:
    static/sass/index.sass
        -Add a gradual CSS `transition` to the search-bar, when a query is
        entered for the first time.

    static/sass/_variables.sass
        -Add bitshift's three new primary base colors.

Add:
    static/sass/main.sass
        -Complete `template/layout.html` positioning rules.
        -Add some styling to the footer.

    static/sass/_variables.sass
        -Add `SASS` partial to contain all project-wide variables.

    templates/index.html
        -Add project-wide layout template (should've been packaged into the
        previous commit).