[DOCS] Fix dev docs deploying to /dev/dev/ instead of /dev/ (#2289)

The ci_site.sh script was overriding the VuePress dest to
"generated/site/dev" in dev mode. Since task-docs.yml already sets
destination_dir: "dev" in the GitHub Pages deploy step, this caused
the site to be nested at /dev/dev/ on gh-pages, leaving
docs.openmqttgateway.com/dev/ empty.

Remove the dest override and let the deploy action handle the
subdirectory placement.

Co-authored-by: Florian <1technophile@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

scripts/ci_site.sh

@@ -113,11 +113,8 @@ create_configuration_files() {
     local url_prefix="$1"
     local version="$2"
     local mode="$3"
-    local dest_line=""
-
-    if [[ "$mode" == "dev" ]]; then
-        dest_line="    \"dest\": \"generated/site/dev\","
-    fi
+    # Note: dest is always "generated/site" (from defaults.json).
+    # The dev subdirectory is handled by destination_dir in the GitHub Actions deploy step.
 
     # download common config
     download_common_config
@@ -130,7 +127,6 @@ create_configuration_files() {
     "title": "Theengs OpenMQTTGateway",
     "version": "${version}",
     "url_prefix": "${url_prefix}",
-    ${dest_line}
     "mode": "${mode}"
 }
 EOF