Update website icons and manifest files

- Updated apple-touch-icon.png with a new version.
- Added favicon-96x96.png as a new file.
- Updated favicon.ico with a new version.
- Added favicon.svg as a new file containing SVG data.
- Updated icon-192x192.png with a new version.
- Added web-app-manifest-192x192.png as a new file.
- Added web-app-manifest-512x512.png as a new file.

Author: darmie