Add state management

[rashil2000]

To improve the general performance and reliability of the frontend, Redux state management should be added to manage API requests and dispatch actions.

[rsriramc]

I would like to contribute and take up on this issue.

The changes to code organization (project structure) during the Reduxification can be as follows:

• Authentication can be moved to the Redux Store since that keeps the logic of Authentication seperate from the individual components to make them clearer.

• Changing the Theme: About.js and App.js, Both have code for changing the theme. Also accessing, modifying the theme in the store would be helpful.

• Storing the posts in the Redux store. Posts on the homepage and Profile page are fetched from the backend each time that page is visited. So reduxifying this decreases the number of network calls.

• For later purposes, we can also store the comments on the posts in the Store.

[rashil2000]

Great! I have assigned this issue to you. Let's start working!

Keep in mind the milestone for this issue :)