Ensure deployment is always in a usable state

Prior to this change, index.html was deployed before all episode media
files which could lead to the episode already being shown as available
while the media is still being uploaded.

deploy.sh

@@ -19,4 +19,4 @@ case "$target" in
 esac
 
 nix build -o "result-${target}" -L ".#${nix_package}"
-rsync -varzLP --delete "result-${target}/" "schabernack@yuzuru.sbruder.xyz:${directory}"
+rsync -varzLP --delete --delay-updates "result-${target}/" "schabernack@yuzuru.sbruder.xyz:${directory}"