repo: remove Flatpak manifest/assets and ignore flatpak-builder dirs

.gitignore

@@ -11,3 +11,7 @@
 /pkg
 /pkg/
 /src/
+
+# Flatpak / flatpak-builder
+.flatpak-builder/
+build-dir/

com.circlewithadot.Relibre.yml

@@ -1,38 +0,0 @@
-app-id: com.circlewithadot.Relibre
-runtime: org.gnome.Platform
-runtime-version: "47"
-sdk: org.gnome.Sdk
-sdk-extensions:
-  - org.freedesktop.Sdk.Extension.golang
-command: relibre
-
-modules:
-  - name: relibre
-    buildsystem: simple
-    build-commands:
-      # 1) Work from a writable copy (sources are ro via rofiles)
-      - install -d /run/build/relibre/src
-      - cp -a . /run/build/relibre/src
-
-      # 2) Enable CGO for webkitgtk
-      - cd /run/build/relibre/src && go env -w CGO_ENABLED=1
-
-      # 3) Patch vendored pkg-config name if needed (4.0 -> 4.1 on GNOME 47)
-      - |
-        cd /run/build/relibre/src
-        files=$(grep -R -l 'webkit2gtk-4\.0' vendor || true)
-        if [ -n "$files" ]; then
-          sed -i 's/webkit2gtk-4\.0/webkit2gtk-4\.1/g' $files
-        fi
-
-      # 4) Build from the writable copy using the vendored modules
-      - cd /run/build/relibre/src && go build -mod=vendor -trimpath -ldflags "-s -w" -o /app/bin/relibre
-
-      # 5) Desktop + icon (if present)
-      - if [ -f /run/build/relibre/src/dist/com.circlewithadot.Relibre.desktop ]; then install -Dm644 /run/build/relibre/src/dist/com.circlewithadot.Relibre.desktop /app/share/applications/com.circlewithadot.Relibre.desktop; fi
-      - if [ -f /run/build/relibre/src/dist/com.circlewithadot.Relibre.png ]; then install -Dm644 /run/build/relibre/src/dist/com.circlewithadot.Relibre.png /app/share/icons/hicolor/512x512/apps/com.circlewithadot.Relibre.png; fi
-
-    sources:
-      - type: dir
-        path: .
-

dist/com.circlewithadot.Relibre.desktop

@@ -1,9 +0,0 @@
-[Desktop Entry]
-Type=Application
-Name=Relibre
-Comment=Generate single-file landing pages for music releases
-Exec=relibre
-Icon=com.circlewithadot.Relibre
-Categories=AudioVideo;Utility;
-Terminal=false
-