Add volume for themes source directory

docker-compose.yml

@@ -28,6 +28,9 @@ services:
     restart: always
     stop_grace_period: 120s
     volumes:
+       # Uncomment the line below to get access to the slide themes directory.
+       # To use the themes, copy them to the slideThemes directory and run `docker exec -it <container-name> /usr/bin/documentserver-generate-allfonts.sh`
+       #- ./slideThemes:/var/www/onlyoffice/documentserver/sdkjs/slide/themes/src
        - /var/www/onlyoffice/Data
        - /var/log/onlyoffice
        - /var/lib/onlyoffice/documentserver/App_Data/cache/files