Move long commands from dotbot config into scripts

Move long commands from the dotbot config into own scripts to keep the
install.conf.yaml more readable.
Fix bug that the submodule init step fails when already done once since
then the grep statement fails because there is no output.

meta/install.conf.yaml

@@ -1,15 +1,14 @@
 - shell:
     -
-      command: git submodule update --init --recursive --jobs 8 --depth 1 2>&1 | grep "Cloning into"
+      command: meta/submodules --init
       description: Pulling all submodules
       stdout: true
       stderr: true
     -
-      command: /bin/sh -c 'tmpd="$(mktemp -d)"; for file in .config/*; do [ ! -e "$HOME/$file" ] || mv "$HOME/$file" "$tmpd"; done; rmdir "$tmpd" 2>/dev/null && echo "Nothing to archive" || { name="existing-$(date +"%s").tar.gz"; tar czvf "$name" "$tmpd" && rm -rf "$tmpd" && echo "$name created"; }'
+      command: meta/archive
       description: Archiving all files in ~/.config before overwriting them
       stdout: true
       stderr: true
-      quiet: true
     -
       command: .config/zsh/plugins/fzf/install --bin
       description: Pulling fzf binary