https://www.cssscript.com/dark-mode-switcher-bootstrap-5/#google_vignette
https://www.cssscript.com/demo/dark-mode-switcher-bootstrap-5/
https://getbootstrap.com/docs/5.3/customize/color-modes/#javascript
Install bootstrap icon:
https://icons.getbootstrap.com/
https://icons.getbootstrap.com/#install
https://icons.getbootstrap.com/icons/sun-fill/
https://www.freecodecamp.org/news/css-responsive-image-tutorial/
https://blog.scaleflex.com/responsive-image-and-plugins/
https://levelup.gitconnected.com/responsive-image-using-aspect-ratio-no-media-queries-are-needed-2abef1544c96
https://uploadcare.com/learning/guides/making-images-responsive/
https://imagekit.io/responsive-images/
https://webdesign.tutsplus.com/tutorials/quick-tip-how-to-use-html5-picture-for-responsive-images--cms-21015
https://www.freecodecamp.org/news/what-are-css-variables-and-how-to-use-them/
