add css, edit page Threads

diskuy/.eslintcache

diskuy/package.json

diskuy/public/index.html

diskuy/src/App.js

diskuy/src/Navbar.css

diskuy/src/Navbar.js

diskuy/src/Profile/Profile.js

diskuy/src/Search.js

diskuy/src/ThreadList.js

diskuy/src/Threads/ListThreads.css

diskuy/src/Threads/ListThreads.js

diskuy/src/Threads/PreviewThread.css

diskuy/src/Threads/PreviewThread.js

diskuy/src/Threads/RecentThreads.css

diskuy/src/Threads/RecentThreads.js

diskuy/src/Threads/TopThreads.js

diskuy/src/Topic.js