* fix accesibility issues:
- index.vue: input without label
- about.vue: color contrast doesn't have sufficient contrast ratio on code sample on light theme
* optimize png icons:
pwa-192x192.png: -31.04%
pwa-512x512.png: -14.66%
use https://ezgif.com/
* chore: color
Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>
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