Improve error message readability

[bigluck]

The explorer does not honor the new lines on error messages.

In my case the API endpoint returned this response error:

{
    "error": "Parser exception: Invalid input <MATCH\n    (task:PhyTask)-[r1:HasPhyTaskImplementation]->(task_impl:PhyTaskCode),\n    (docker_task:PhyTask)-[r2:PhyTaskFollowBy]->(task),\n    (docker_task)-[r3:HasPhyTaskImplementation]->(docker_task_impl:PhyTaskDockerImagePull)\nWHERE\n    task_impl.pip_dependencies IS NOT NULL\nUNWIND task_impl.pip_dependencies\nRETURN>: expected rule oC_SingleQuery (line: 8, offset: 0)\n\"RETURN *\"\n ^^^^^^"
}

But the explorer makes it harder to read:

[mewim]

I have changed the rendering of the error messages using the <pre> element to preserve the line breaks and defaults to monospace font. This should hopefully improve the readability.