Doc: Update global documentation config for Qt 6

- Set base URL path to /qt
- Define 'qt6' for use in conditionals
- Omit \since information for everything introduced
  before Qt 5
- Make use of the new expandable variables to allow
  component-specific URLs in commercial templates
- Adjust CSS for changes in QDoc's output

Change-Id: I74581f0fb49cd176f92d6451c388e7b7ddf1baa4
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

3 files changed, 4 insertions, 15 deletions

diff --git a/doc/global/template/style/offline-simple.css b/doc/global/template/style/offline-simple.css
index b89ca5a808..83fa15ca17 100644
--- a/doc/global/template/style/offline-simple.css
+++ b/doc/global/template/style/offline-simple.css
@@ -102,7 +102,7 @@ h3.fn .name, h3.fn .type {
   font-weight: 400;
 }
 
-.qmlreadonly, .qmldefault {
+.qmlextra {
   font-family: Courier, monospace;
   margin-right: 6px;
 }
diff --git a/doc/global/template/style/offline.css b/doc/global/template/style/offline.css
index f99369a096..3f99aec978 100644
--- a/doc/global/template/style/offline.css
+++ b/doc/global/template/style/offline.css
@@ -586,13 +586,7 @@ ol.a > li{
     padding: 20px 20px 20px 20px;
 }
 
-.qmldefault {
-    padding-left: 5px;
-    float: right;
-    color: red;
-}
-
-.qmlreadonly {
+.qmlextra {
     padding-left: 5px;
     float: right;
     color: #254117;
diff --git a/doc/global/template/style/online.css b/doc/global/template/style/online.css
index 4e17d9a8a9..a21dca37ae 100644
--- a/doc/global/template/style/online.css
+++ b/doc/global/template/style/online.css
@@ -489,18 +489,13 @@ h1,h2,h3,h4,h5,h6 {
   text-align:left;
   padding:5px 0 0 0
 }
-.qmlreadonly,.qmldefault {
+.qmlreadonly,.qmldefault,.qmlextra {
+  color:#414141;
   padding:0 5px 0 5px;
   font-size:0.75em;
   background-color:#eee;
   float:right
 }
-.qmlreadonly {
-  color:#414141
-}
-.qmldefault {
-  color:#D14141
-}
 .rightAlign {
   padding:3px 5px 3px 10px;
   text-align:right