[FEAT] Display information about query param usage for the hacktoberfest and monitoring demo

[tbouffard]

Is your feature request related to a problem? Please describe.
The 2 demos consider query parameters to choose use case, theme, data type #457 and #563.
They are not visible for end user but only for people who look at the code or follow release notes.

Describe the solution you'd like
Display the information about how to use the query parameter. Ideally, an information button/icon should be available and when the user click on it, they will see the list of query parameter with a clickable link opening a new window for demonstration.

Describe alternatives you've considered
Document the query parameters in the README or in the HTML comments. This will only target curious developers.