Fix icon rendering on main page

[laurent22]

I guess the icon should be centered within the tile, like it is when a plugin icon is not available:

[personalizedrefrigerator]

Changed in https://github.com/joplin/website-plugin-discovery/commit/d4c1bfced6b5491e0c98bc473001c5232be94553

[laurent22]

Sorry I meant the icon should be the same size as the one in the default tiles. We want avoid giant icons if possible.

So something like this:

Actually maybe we can even keep the decorations around the icon?

[shubhratiwary134]

Is someone Already working on this issue ?

[laurent22]

I don't think there is, feel free to give it a try if you're interested