Update Execom Images on the Main Website for new Execom 2023-24

[Prajwalprakash3722]

• [x] Resize the images to fit the dimensions required by the website.
• [x] Replace the old images on the website with the new ones.
• [x] Test the website to make sure that the images are displaying correctly.

Deadline 4/03/2023

people responsible @MayurSChittaragi @sannidhi-s-shetty @naveenbteli