Always display the download icon

[wilzbach]

Based on feedback from the NG:

https://dlang.org/install.html
I've never seen that page. Would've helped me to see it earlier. The D download page should include a blurb with a link to that install page.
https://forum.dlang.org/post/zwizsobrbboibzqrussm@forum.dlang.org

From @quickfur:

Wow. I set out deliberately looking for that link, and couldn't find it until I looked at your screenshot. I definitely wouldn't have found it if I didn't even know it was there.
https://forum.dlang.org/post/mailman.2877.1517420581.9493.digitalmars-d@puremagic.com

The info buttons have been added in: #1697

And the install.sh page was added in: #1936

[wilzbach]

Before:

After:

[uvtc]

Oh my! All of those OS-specific icons have links associated with them, but only the little gray "(i)" ⓘ is clickable! I had no idea. I don't recognize that ⓘ as a link. Maybe it needs to be brighter (not gray) and/or enclosed in a rounded-corner box like the links to the os-specific DMD archives. It definitely should not only show up when hovering.

[uvtc]

See also https://issues.dlang.org/show_bug.cgi?id=18344.

[bachmeil]

I think it would be better to provide information about the script on the page, because someone new to D is unlikely to investigate the install script further (there's a lot of information on that page). I've been using D for years and didn't know the details of the install script until now. My recommendation is to put this text before the curl command:

The install.sh script is the official D version manager for DMD, GDC and LDC on FreeBSD, Linux and macOS. It provides a convenient way to fetch and install a D compiler without requiring administrative privileges or external dependencies. For more information, see {link to https://dlang.org/install.html}.