Docs: fix link (jupyterbook doesn't use standard markdown references)

docs/02-usage/040_workflow.md

@@ -12,6 +12,7 @@ setting up a project with Serena typically involves the following steps:
 3. **Onboarding**: Getting Serena familiar with the project (creating memories)
 4. **Working on coding tasks**: Using Serena to help you with actual coding tasks in the project
 
+(project-creation-indexing)=
 ## Project Creation & Indexing
 
 You can create a project either  

docs/02-usage/050_configuration.md

@@ -22,7 +22,7 @@ Serena is configured in four places:
    See for a detailed explanation. You can override all entries from the `serena_config.yml` through command line arguments.
 3. In the `.serena/project.yml` file within your project. This will hold project-level configuration that is used whenever
    that project is activated. This file will be autogenerated when you first use Serena on that project, but you can also
-   create it explicitly with `serena project create [options]` (see the [Project Workflow](040_workflow.md#project-creation--indexing) 
+   create it explicitly with `serena project create [options]` (see the [](project-creation-indexing) 
    for details on available options).
 4. Through the context and modes (see below).