fix: update slideshow text from 'Arch Linux' to 'Artix Linux'

Slide 0 said 'A modern Arch Linux experience' - change to 'Artix Linux'
Slide 2 footer said 'Full access to Arch Linux repositories' - change to 'Artix Linux'
Bump pkgrel 19 -> 20

packages/calamares-branding-antergos-next/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=calamares-branding-antergos-next
 pkgver=1.0
-pkgrel=19
+pkgrel=20
 pkgdesc="Calamares branding for Antergos NeXT with offline/online installer support"
 arch=('any')
 url="https://github.com/Antergos-NeXT"

packages/calamares-branding-antergos-next/show.qml

@@ -58,7 +58,7 @@ Item {
             slides: [
                 Dia {
                     title: qsTr("Welcome to Antergos NeXT")
-                    body: qsTr("A modern Arch Linux experience with OpenRC and elogind")
+                    body: qsTr("A modern Artix Linux experience with OpenRC and elogind")
                     footer: qsTr("Choose your preferred desktop environment during setup")
                 },
                 Dia {
@@ -69,7 +69,7 @@ Item {
                 Dia {
                     title: qsTr("Antergos Tools")
                     body: qsTr("Welcome app for system configuration, Calamares installer with offline and online modes, and HAL package manager")
-                    footer: qsTr("Full access to Arch Linux repositories and the AUR")
+                    footer: qsTr("Full access to Artix Linux repositories and the AUR")
                 },
                 Dia {
                     title: qsTr("Open Source")