🔧 Configure many things

[loxygenK]

• 🔨 Create command for check type errors continuously
• 🔧 Fallback 404 to index.html in webpack-dev-server for routing
• ✨ Create stab for Main page
• ⭐ Transition to /me after the splash
• 💄 Place things center and set background
• 🎨 Modify ContentWrapper for the better extension
• ♻ Reduce unneccesary nesting level
• 🚚 Move initializing styles into styling/
• 📱 Specify viewport for the responsivity
• 🍱 Add new web font 'IBM Plex Sans'
• ✨ Create page wrapper
• 🎨 Wrap page content by PageWrapper
• 🚨 Style code for prettier format
• 🔧 Disable the warning for not declared return types only for components
• 🔧 Tell eslint the version of React
• 🚨 Fix eslint issues