Add search field input color to override Bootstrap

[kellyi]

Overview

• override the Bootstrap input color settings (and those of other style-sheets) by giving a specific color property to the search input field styles

Connects https://github.com/azavea/pwd-stormwater-interactive/issues/524

Demo

Without the color setting:

With the color setting:

Testing Instructions

The real test will be when this goes into Stormwater Interactive, but for now check the screenshots above and also verify that the Netlify deployment for this branch works correctly.

[kellyi]

Thanks!