Bootstrap frontend

[webmaster442]

• [x] Rework frontend to use bootstrap
• [x] Service worker and manifest updated
• [x] Print is a sepperate document
• [x] Dark mode toggle
• [x] Dark mode inverts the hue of images

[webmaster442]

https://www.codeply.com/p/BmyKLq8RTV

[webmaster442]

        img, svg {
            filter: invert(1) hue-rotate(180deg);
        }