Install/build instructions are broken

[odenix]

Following the README instructions resulted in an error:

Install dependencies
$ ./gradlew downloadPklHtmlHighlighter npmInstall

$ ./gradlew downloadPklHtmlHighlighter npmInstall
FAILURE: Build failed with an exception.

* What went wrong:
Task 'downloadPklHtmlHighlighter' not found in root project 'pkl-lang.org'.

I tried to run gw buildLocalSite nevertheless, but it failed with:

> Task :pklHtmlHighlighter FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':pklHtmlHighlighter'.
> A problem occurred starting process 'command 'cargo''

Ideally, a Gradle build shouldn't require "manual" installation steps.

[dax-w]

the same problem