feat: add search bar to nav bar

[hroth1994]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Adds a search bar component to the nav bar, currently only for desktop views. This is not meant to be perfect, but rather a first pass at a search bar to be integrated into es-cms-pages
Adds a prop to the nav bar showSearch to enable the search icon. Defaults to false as to not affect existing functionality.

🥼 Testing

Tested locally at http://localhost:8500/organisms/es-nav-bar - click search icon to open/close, x icon also closes search bar

🧐 Feedback Requested / Focus Areas

• General

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.
• I have documented testing approach

[nathanielwarner]

Good start on this!