Fix top navigation bar highlighting (#1044)

docs/getting_started/clearml_agent_docker_exec.md

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+---
+title:   Building Executable Task Containers
+---
+
+## Exporting a Task into a Standalone Docker Container
+
+### Task Container
+
+Build a Docker container that when launched executes a specific task, or a clone (copy) of that task.
+
+- Build a Docker container that at launch will execute a specific Task:
+
+  ```bash
+  clearml-agent build --id <task-id> --docker --target <new-docker-name> --entry-point reuse_task
+  ```
+
+- Build a Docker container that at launch will clone a Task specified by Task ID, and will execute the newly cloned Task:
+
+  ```bash
+  clearml-agent build --id <task-id> --docker --target <new-docker-name> --entry-point clone_task
+  ```
+
+- Run built Docker by executing:
+
+  ```bash
+  docker run <new-docker-name>
+  ```
+
+Check out [this tutorial](../guides/clearml_agent/executable_exp_containers.md) for building executable task 
+containers.