Clean the blank lines for sort

[Neha]

1. Suggestion from @DeRaowl to implement click event on header instead of clicking on arrow cursors.
2. Run prettier on files changed for PR Implemented sort feature on created date column #63
3. Change related tests after implementing 1.

Neha's initial ticket
Clean the blank lines for the sort

postcss import to be check- why we need it

css to be optimized

[Tejas-ChandraShekarRaju]

Parent ticket:#63