Describe the bug
dokka-customFormat-example not wokring

I also tried what you said in the comments.
#2584

but not working.
(./gradlew dokkaHtml and ./gradlew dokkaCustomFormat)

Expected behaviour
ktor-logo.png is shown. (left-top)

Screenshots

To Reproduce

1. pull this repository
2. cd /dokka/examples/gradle/dokka-customFormat-example
3. run sh (./gradlew dokkaHtml or ./gradlew dokkaCustomFormat)
4. i expect that left-top icon is ktor-logo.png. but nothing.

Installation

• Operating system: macOS
• Build tool: Gradle v6.6.0
• Dokka version: 1.7.10