fix: friendlier experience in the "yafti" first boot template

- The first screen's "Pick some applications to get started" has been replaced with a friendly welcoming message.

- The second screen's difficult-to-understand "WARNING: This will modify your Flatpaks if you are rebasing!" has been replaced with an explanation of what it actually does.

- The application setup screen is now titled "Application Installer", since the previous title sounded too much like a silly rhyme. It's a minor change.

- All Flatpaks now default to system-wide install thanks to the great work of bsherman at https://github.com/ublue-os/yafti/pull/82. This saves tons of disk space for multi-user systems.

- The "system application" category have been split up into GNOME apps and every other system app, so that people on other desktop environments don't get all the GNOME apps.

- Apps that had too vague descriptions have been renamed to their full names, such as "Backup -> Deja Dup Backups".

- All app lists have been sorted alphabetically.

- Non-inclusive language in descriptions has been changed.

- Added SteamTinkerLaunch as a suggestion for the Steam category, which is the best tool for managing Steam game configurations and Proton installations, albeit very advanced since it can do practically anything the gamer needs. :)

usr/share/ublue-os/firstboot/yafti.yml

@@ -8,15 +8,15 @@ screens:
       title: "Welcome to uBlue (Alpha)"
       icon: "/path/to/icon"
       description: |
-        Pick some applications to get started
+        This guided installer will help you get started with your new system.
   can-we-modify-your-flatpaks:
     source: yafti.screen.consent
     values:
-      title: Welcome, Traveler
+      title: Welcome, Traveler!
       condition:
         run: flatpak remotes --system | grep fedora
       description: |
-        WARNING: This will modify your Flatpaks if you are rebasing! If you do not want to do this exit the installer.
+        We have detected the limited, Fedora-provided Flatpak remote on your system, whose applications are usually missing important codecs and other features. This step will therefore remove all basic Fedora Flatpaks from your system! We will instead switch all core Flatpak applications over to the vastly superior, unfiltered Flathub. If you don't want to do this, simply exit this installer.
       actions:
         - run: flatpak remote-delete fedora --force
         - run: flatpak remove --system --noninteractive --all
@@ -24,37 +24,44 @@ screens:
   applications:
     source: yafti.screen.package
     values:
-      title: Application Installation
+      title: Application Installer
       show_terminal: true
       package_manager: yafti.plugin.flatpak
+      package_manager_defaults:
+        user: false
+        system: true
       groups:
-        Core:
+        Core GNOME Apps:
-          description: Core Applications
+          description: Core system applications for the GNOME desktop environment.
           default: true
           packages:
-            - Backup: org.gnome.DejaDup
             - Calculator: org.gnome.Calculator
             - Calendar: org.gnome.Calendar
             - Characters: org.gnome.Characters
+            - Clocks: org.gnome.clocks
             - Connections: org.gnome.Connections
             - Contacts: org.gnome.Contacts
+            - Disk Usage Analyzer: org.gnome.baobab
             - Document Viewer: org.gnome.Evince
             - Extensions Manager: com.mattjakeman.ExtensionManager
-            - Fedora Media Writer: org.fedoraproject.MediaWriter
+            - Font Viewer: org.gnome.font-viewer
-            - Mozilla Firefox: org.mozilla.firefox
-            - Flatseal Permissions Manager: com.github.tchx84.Flatseal
             - Logs: org.gnome.Logs
             - Maps: org.gnome.Maps
             - Nautilus Preview: org.gnome.NautilusPreviewer
+            - Picture Viewer: org.gnome.eog
             - Text Editor: org.gnome.TextEditor
             - Weather: org.gnome.Weather
-            - Disk Usage Analyzer: org.gnome.baobab
+        System Apps:
-            - Clocks: org.gnome.clocks
+          description: System applications for all desktop environments.
-            - Picture Viewer: org.gnome.eog
+          default: true
-            - Font Viewer: org.gnome.font-viewer
+          packages:
+            - Deja Dup Backups: org.gnome.DejaDup
+            - Fedora Media Writer: org.fedoraproject.MediaWriter
+            - Flatseal Permissions Manager: com.github.tchx84.Flatseal
             - Font Downloader: org.gustavoperedo.FontDownloader
+            - Mozilla Firefox: org.mozilla.firefox
         Web Browsers:
-          description: Additional browsers to complement Firefox
+          description: Additional browsers to complement or replace Firefox.
           default: false
           packages:
             - Brave: com.brave.Browser
@@ -67,24 +74,25 @@ screens:
           packages:
             - Bottles: com.usebottles.bottles
             - Discord: com.discordapp.Discord
-            - Games: org.gnome.Games
+            - GNOME Games: org.gnome.Games
             - Heroic Games Launcher: com.heroicgameslauncher.hgl
-            - MangoHUD: org.freedesktop.Platform.VulkanLayer.MangoHud//22.08
             - Steam: com.valvesoftware.Steam
-            - Gamescope for Steam: com.valvesoftware.Steam.Utility.gamescope
+            - Gamescope (Utility): com.valvesoftware.Steam.Utility.gamescope
+            - MangoHUD (Utility): org.freedesktop.Platform.VulkanLayer.MangoHud//22.08
+            - SteamTinkerLaunch (Utility): com.valvesoftware.Steam.Utility.steamtinkerlaunch
             - Proton Updater for Steam: net.davidotek.pupgui2
         Office:
-          description: Bow to Capitalism
+          description: Boost your productivity.
           default: false
           packages:
             - LibreOffice: org.libreoffice.LibreOffice
-            - Obsidian: md.obsidian.Obsidian
             - OnlyOffice: org.onlyoffice.desktopeditors
+            - Obsidian: md.obsidian.Obsidian
             - Slack: com.slack.Slack
             - Standard Notes: org.standardnotes.standardnotes
             - Thunderbird Email: org.mozilla.Thunderbird
         Streaming:
-          description: Stream to the Internet
+          description: Stream to the Internet.
           default: false
           packages:
             - OBS Studio: com.obsproject.Studio