Fixed Dashboard and Left section

[Devesh21700Kumar]

Fixes #3652 #3627
Changes: [Add here what changes were made in this pull request and if possible provide links showcasing the changes.]

1). Used MUI styling for some components
2). Fixed scroll and set the position as fixed of the left section/sidebar
3). Ensured responsiveness on screen sizes and different interfaces
4). Fixed all overflows that occurred due to margins
5). No linting errors present

Commands used:-
1). yarn start to run the web app on localhost
2). yarn run lint --fix to fix linting errors

Screenshots of the change:

[isuruAb]

Please don't change the indentation of the code in the same PR. Because it makes the reviewer's job difficult.

[Devesh21700Kumar]

Please don't change the indentation of the code in the same PR. Because it makes the reviewer's job difficult.

I think that the indentation changed because of adding new elements to wrap some components. Running yarn run lint —fix in the end might have caused this.

[isuruAb]

LGTM.

[Devesh21700Kumar]

@isuruAb @Orbiter Pls do merge this one