dokka-customFormat-example/dokkaCustomFormat not working

**Question**
dokka-customFormat-example not wokring

i just did below command line

./gradlew dokkaCustomForamtHtml

i expect that custom logo icon change . but not wokring

**Screenshots**
If applicable, add screenshots to help explain your problem

**Installation**
- Operating system: mac
- Build tool: Gradle v6.6.1
- Dokka version: 1.7.0