feat(about): add europe and region logo + update style

src/app/about/about.component.html

src/app/about/about.component.scss

src/assets/form/sprite.svg

src/assets/img/about_illustration.png

src/assets/img/about_illustration_1.jpg

src/assets/img/about_illustration_2.jpg

src/assets/logos/logo_europe.png

src/assets/logos/logo_region.png