feat: introductory onboarding

package-lock.json

package.json

src/components/Navbar.jsx

src/components/annoucements/Announcement.jsx

src/components/home/AlreadyFinished.jsx

src/components/home/BreakInProgress.jsx

src/components/home/NotYetStarted.jsx

src/components/home/index.js

src/components/onboarding/Beacon.jsx

src/components/onboarding/index.jsx

src/components/posts/Post.jsx

src/onboarding.jsx

src/pages/Home.jsx