[Issue 18401] New: Auto-generate rdmd man page + HTML documentation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18401

          Issue ID: 18401
           Summary: Auto-generate rdmd man page + HTML documentation
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: tools
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

These pages have a tendency to get outdated:

https://github.com/dlang/tools/blob/master/man/man1/rdmd.1
https://dlang.org/rdmd.html

We should generate them like we do for dmd.

They are even outdated atm - search for `--shebang` on the man page.

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