[Issue 19815] New: Documentation for install.sh is hard to find and unnecessarily complex

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19815

          Issue ID: 19815
           Summary: Documentation for install.sh is hard to find and
                    unnecessarily complex
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: installer
          Assignee: nobody at puremagic.com
          Reporter: bugzilla at digitalmars.com

The link to https://dlang.org/install.html is way beyond the fold of
https://dlang.org/download.html, and looks like this:

  Install Script (i)
  curl -fsS https://dlang.org/install.sh | bash -s dmd-nightly

Need to give some exposition here, such as this text:

"The dlang.org/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 nor external
dependencies. (i)"

Leave off the bash command. The installer documentation makes no mention of
-fsS, either. It shouldn't be there if the documentation doesn't cover it.

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