Remove timestamp suffixes from 21 asset files

CLEANUP:
- Renamed 21 files: removed _1234567890 timestamp suffixes
- Updated 3 markdown files (63 references)
- All assets now have clean names without timestamps

EXAMPLES:
- LwzqEXM9B89IWUQCIdZtwo_uYIbYVzdT0g.jpg_1719611264 → LwzqEXM9B89IWUQCIdZtwo_uYIbYVzdT0g.jpg
- Me6P6lhhZUQMhuY--kIQqoFHV6QgrxpO0g.jpg_1719611251 → Me6P6lhhZUQMhuY--kIQqoFHV6QgrxpO0g.jpg

RESULT:
All asset filenames are now clean - no prefixes, no timestamps

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: bharvey88