Refine overall UI Design

- Changed overall color scheme.
- Removed search and sort from nav bar.
- Added widgets for search type/term and total hit count.
- Moved display numbers, pagination, and items per page to single row.
- Each table heading now includes sorting and filtering.
- Change pagination directive to buttons group.
- Created items per page selector directive.
- Edited css for refined overall UI spacing and look.
- Removed unused css labels and classes.
- Added update function to UrlBuilder service.
- Updated search_intro view to match changes in search_results.
- Updated CHANGELOG.md