Update index.html , included preload image in the head so that loadin…

[Knowledgelocater]

…g image should pe optimised

Added Preload images in the head so that loading of image should be optimised.

[Hwurzburg]

@khancyr ping

[khancyr]

Need rebase and squash to have only 1 commit and it will be good !

[Hwurzburg]

I squashed and merged