[docs] Add gadr.io in the showcase

[clabbeaf]

Hi,

I would like to submit a new showcase for gadr.io.
Keep up the good work, big fan of MUI

/Hans

[oliviertassinari]

@clabbeaf Well done with this project and thank you for taking the time to open a pull-request! However, we start to have a lot of projects in the showcase. We are focusing on high traffic websites using Material-UI. I fear that we will reject this change.

[eps1lon]

@oliviertassinari Maybe showcase only "big players" with an image and a simple list for others (if the page is open source)? I think there is some value in collecting as much "callsites" as possible so that we can collect common use cases.

[mbrookes]

I don't have an issue with continuing to add sites for the time being (I have another 20 or so to add). We have quite a few others on the list with lower traffic than gadr.io.

If the page length becomes a problem, then we could always have a "top ten" or top twenty", and move the rest to a grid-list, but if all someone is interested in is the top sites, well, they're already at the top, so they can just stop scrolling. 😄

updated

[clabbeaf]

Thanks.
Did you want me to make the changes posted before?
Saw that the image was removed, was that intentional?

[oliviertassinari]

Let's wait @mbrookes feedback on the change. Yes, I have removed 4 project images.

[clabbeaf]

Ok.
Do you want another image with more material UI components visible or why was it removed?

[clabbeaf]

We're launching right now so there will (hopefully :) ) be more traffic soon. Would really appriciate if we could be more visible on the site.
And we have really gone all in with material UI components

[oliviertassinari]

@clabbeaf Good luck with this project :)