Add nightly flatpak repo

nheko-nightly.flatpakrepo

+[Flatpak Repo]
+Title=Nheko Nightly
+Url=https://flatpak.neko.dev/repo/nightly
+Homepage=https://nheko.im/
+Comment=Nheko nightly release repository
+Description=Nheko nightly release repository
+Icon=https://nheko.im/nheko-reborn/nheko/-/raw/master/resources/nheko.svg
+GPGKey=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