pnboot

Hello ! thanks for this library. Limited to CDN files cannot be accessed offline. https://github.com/leangen/graphql-spqr-spring-boot-starter/blob/master/graphql-spqr-spring-boot-autoconfigure/src/main/resources/playground.html ```html ${pageTitle} ```

Hello ! thanks for this library. Limited to CDN files cannot be accessed offline https://github.com/leangen/graphql-spqr-spring-boot-starter/blob/master/graphql-spqr-spring-boot-autoconfigure/src/main/resources/playground.html ```html ${pageTitle} ``` 1. download static files ```shell curl -s https://raw.githubusercontent.com/leangen/graphql-spqr-spring-boot-starter/master/graphql-spqr-spring-boot-autoconfigure/src/main/resources/playground.html | \ grep -oP...