chore: Reorganize files into folders

to make it plain where each file belongs in the containers file system
and to simplify the `ADD` directives in the Containerfile.

Signed-off-by: Andreas Hartmann <hartan@7x.de>

root/xpackages.txt

@@ -0,0 +1,21 @@
+# This list was formed by running the following commands in the base image:
+#   for package in $(rpm -qa); do if dnf erase $package; then echo "$package" >> remove; fi; done
+#   cat remove
+# Including those packages in this file.  Finally, repeatedly running the container build
+# untill no dependency errors were raised.
+
+criu
+criu-libs
+crypto-policies-scripts
+dejavu-sans-fonts
+findutils
+fonts-filesystem
+gdb-gdbserver
+langpacks-core-en
+langpacks-core-font-en
+langpacks-en
+libnet
+protobuf-c
+rootfiles
+vim-minimal
+yum