Main page

Merge branch main page into develop

In main page:

• Main page layout (toolbar style already changed)
• Bottom navigation bar and interactions
• Fragments (pages) for every tabs (filename already refactored)
• Activity files for every fragment (filename already refactored)
• Notification page & activity
• NotifAdapter to show notifications on recyclerView
• Notification class (with a function to create hardcoded-dummy-content)

*Butterknife haven't used yet here for onClick handler