Upgrade browse page

[Mitan4E]

Added upgrades the the browse page

• Skeleton loaders have been added, they activate what the user scrolls to the bottom of the browse page
• Posts are now by default sorted by newest when the browse page is opened
• Added many sorting options (newest, oldest, most/least liked, and post type)
• Added functionality for liking posts (this required two new tables in the database)
• TO DO:
• Style everything, I have done no styling other than for the loading skeletons, but the functionality looks like it is all working.

[AkhilG4]

Look good but I don't like how if you try to like while not being logged in, it shows a generic "please log in to like" alert. We should instead just make the login modal appear