Fixed social icons/navigation overlapping footer if little content
- Added 404 page flat file
General refactoring tasks
- Removed unused function from functions.php
- Updated flat file <body> classes from those output on Dev
- Removed most section-specific LESS files (section-home.less still to remove)
- Added "Bio Image" LESS page component
- Added archive header to Blog index
- Added search filter to prevent pages from showing in search results