Link to https://run.dlang.io/ ??

[Dennis]

I recently tried to go to that site, and I tried `run.dlang.com` 
which is the wrong URL. So I was looking through the D homepage 
for the right link but couldn't find it. Even a Google search for 
"online d compiler" or "run dlang online" didn't turn up anything 
directly, I had to go through the "Online compilers" page on the 
D wiki to finally get the right URL. And I already knew it 
existed.

Putting more links to it definitely seems like a good idea since 
it's such a useful tool.