Use an image from a pc for a web server

I'm trying to make a web server and since I won't have internet access once I present it I was wondering, how can I save the files in my pc to then share them in a way that anyone in the local network is going to be able to look at them once they access the page? I'm storing the html file in a micro sd card and loading it in the ethernet shield 1, I'm using an arduino mega.

how is the image related to arduino and to the html page stored on sd card?