replaygain: fix up doc links to defunct replaygain.org website

Fixes #624
20 jobs for docs-fix-up-replaygain-links in 48 minutes and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Preparation
passed #493864
gst indent

00:00:29

passed #493863
manifest

00:00:43

 
  Build
passed #493870
build cerbero android universal

00:12:50

passed #493871
build cerbero cross win32

00:08:52

passed #493872
build cerbero cross win64

00:07:52

passed #493869
build cerbero fedora x86_64

00:07:49

manual #493874
gst-ios-12.2 allowed to fail manual
build cerbero ios universal
passed #493873
gst-macos-10.14
build cerbero macos x86_64

00:06:58

passed #493865
build fedora x86_64

00:06:29

passed #493866
build nodebug fedora x86_64

00:07:11

passed #493867
build static fedora x86_64

00:12:36

passed #493868
build static nodebug fedora x86_64

00:12:58

 
  Test
passed #493875
check fedora

00:05:09

passed #493876
integration testsuites fedora

00:15:37

passed #493878
valgrind bad

00:09:11

passed #493879
valgrind ges

00:12:21

passed #494031
valgrind good

00:09:03

failed #493877
valgrind good

00:19:12

 
  Integrate
passed #493880
android universal examples

00:10:16

passed #493881
documentation

00:06:56