[FEAT] Gallery Section

[gaurovgiri]

          Not sure exactly how many to add but suppose if we want add other images related to a event, we can organize those images in a folder.

We can name images with number like assets/images/events/<some_event>/{1.png, 2.png, 3.png, thumbnail.png, banner.png}
we can later add gallery list in the front matter for each markdown such that it is easier to apply loop and display those images in our gallery.

Let's create an issue on this for now.

Originally posted by @gaurovgiri in #122 (comment)