Too small images on index

[abhigyanghosh30]

Images of the events on the index page is too small

[GaurangTandon]

@abhigyanghosh30 we need to get some image to put there, currently it is blank
then we can think of resizing them

[GaurangTandon]

@GaurangTandon Ohk, sorry, just saw you added some nice images in index_images branch. Looks merge-able imo