feat: add lazy loading

package.json

src/js/components/LazyLoadedImage/LazyLoadedImage.js

src/js/sections/CloudSection/CloudSection.js

src/js/sections/LandingSection/LandingSection.js

src/js/sections/OctopusSection/OctopusSection.js

src/js/sections/StatsSection/StatsSection.js

src/js/sections/TowerSection/TowerSection.js

src/js/sections/VscodeSection/VscodeSection.js

yarn.lock