[welcomeq] make release notes part of welcome window

use Loader option for those notes too, commented out file shows it is possible to load from anywhere

src/modules/welcomeq/release_notes.qml

@@ -0,0 +1,100 @@
+/* === This file is part of Calamares - <https://github.com/calamares> ===
+ *
+ *   Copyright 2020, Anke Boersma <demm@kaosx.us>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import io.calamares.ui 1.0
+
+import QtQuick 2.7
+import QtQuick.Controls 2.2
+import QtQuick.Window 2.2
+import QtQuick.Layouts 1.3
+
+Rectangle {
+    width: parent.width
+    height: parent.height
+    focus: true
+    color: "#f2f2f2"
+
+    Flickable {
+        id: flick
+        anchors.fill: parent
+        contentHeight: 3500
+        
+        ScrollBar.vertical: ScrollBar {
+            id: fscrollbar 
+            width: 10
+            policy: ScrollBar.AlwaysOn
+        }
+
+        TextArea {
+            id: intro
+            x: 130
+            y: 8
+            width: 640
+            font.pointSize: 14
+            textFormat: Text.RichText
+            antialiasing: true
+            activeFocusOnPress: false
+            wrapMode: Text.WordWrap
+
+            text: qsTr("<h3>%1</h3>
+            <p>This an example QML file, showing options in RichText with Flickable content.</p>
+
+            <p>QML with RichText can use HTML tags, Flickable content is useful for touchscreens.</p>
+
+            <p><b>This is bold text</b></p>
+            <p><i>This is italic text</i></p>
+            <p><u>This is underlined text</u></p>
+            <p><center>This text will be center-aligned.</center></p>
+            <p><s>This is strikethrough</s></p>
+
+            <p>Code example:
+            <code>ls -l /home</code></p>
+
+            <p><b>Lists:</b></p>
+            <ul>
+                <li>Intel CPU systems</li>
+                <li>AMD CPU systems</li>
+            </ul>
+
+            <p>The vertical scrollbar is adjustable, current width set to 10.</p>").arg(Branding.string(Branding.VersionedName))
+
+        }
+    }
+
+    ToolButton {
+        id: toolButton
+        x: 19
+        y: 29
+        width: 105
+        height: 48
+        text: qsTr("Back")
+        hoverEnabled: true
+        onClicked: load.source = ""
+
+        Image {
+            id: image1
+            x: 0
+            y: 13
+            width: 22
+            height: 22
+            source: "img/chevron-left-solid.svg"
+            fillMode: Image.PreserveAspectFit
+        }
+    }
+
+}

src/modules/welcomeq/welcomeq.qml

@@ -110,7 +110,8 @@ Page
                 Kirigami.Theme.textColor: Kirigami.Theme.textColor
 
                 visible: config.releaseNotesUrl !== ""
-                onClicked: Qt.openUrlExternally(config.releaseNotesUrl)
+                onClicked: load.source = "release_notes.qml"
+                //onClicked: load.source = "file:/usr/share/calamares/release_notes.qml"
             }
             
             Button {

src/modules/welcomeq/welcomeq.qrc

@@ -2,6 +2,7 @@
 <qresource>
   <file alias="welcomeq.qml">welcomeq.qml</file>
   <file alias="about.qml">about.qml</file>
+  <file alias="release_notes.qml">release_notes.qml</file>
   <file>img/squid.png</file>
   <file>img/chevron-left-solid.svg</file>
   <file>img/language-icon-48px.png</file>