Update the tutorial "Create a simple dashboard to monitor website logs"

[alaudazzi]

This PR aligns the doc page https://www.elastic.co/docs/explore-analyze/dashboards/create-dashboard-of-panels-with-web-server-data with the current UI.

Fixes https://github.com/elastic/platform-docs-team/issues/692

[github-actions]

🔍 Preview links for changed docs

• explore-analyze/dashboards/create-dashboard-of-panels-with-web-server-data.md

[alaudazzi]

Notes taken to be considered for the final review:

• workspace or layer pane, do we need both terms?
• shall we specify where and how you can clear the layer? It's not very intuitive from the UI
• what we initially create is called "Visualization" but then the result is called "panel"

[alaudazzi]

What does the asterix represent?

[alaudazzi]

I cannot reproduce these steps:

In the Suggestions, click the line chart.
In the editor toolbar, open the Visualization type dropdown, then select Line.
In the layer pane, open the Layer visualization type menu, then click Line.

Either the UI changed or I'm missing some steps.
@nastasha-solomon @florent-leborgne any idea?

I've just confirmed with dev that the UI changed. I'll update the text.

[mdbirnstiehl]

LGTM!