Add popup for information about page access statistics [Wait for #3130]

[MizukiTemma]

Short description

This PR adds an pop-up on the statistics page and shows users hints for better interpretation of statistics.

Proposed changes

• Reuse the functinality of tutorial pop-up for page tree
• Show the texts suggested by the service team

Side effects

• In the design the icon ℹ️ should be placed next to "Page access staistics/Seitenzugriffe" (second box under "Total accesses/Anzahl der Online-Zugriffe") but currently implemented next to the title "Statistics", as the box "Page access statistics" is not yet implemented.

Resolved issues

Fixes: #3132

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Pull Request Review Guidelines

[MizukiTemma]

Some hints to "see" the pop up

• Set statistics_tutorial_seen" to true as it is false in the test data.
• Or click ℹ️ icon next to the title "Statistics"

[lunars97]

Thank you for your PR! Everything looks good except for one remark :)

[lunars97]

LGTM 👍

[JoeyStk]

Thank you very much!
This looks already quite good. I think the styling needs a few twist, but then this is good to go 🚀
However I spoke with @osmers and this shouldn't be released before #3130, so it might sense to add the blocked label once this is approved and ready :)

[JoeyStk]

Thank you very much. Looks good! 🚀

[MizukiTemma]

Turned into draft to avoid accidental merge. This PR should be first merged after #3130 is done.

[JoeyStk]

@MizukiTemma I think you can wrap this inside the beta permission and merge this now :)

[MizukiTemma]

@JoeyStk

Hmm, how should we go with the position of icon?

In the design the icon ℹ️ should be placed next to "Page access staistics/Seitenzugriffe" (second box under "Total accesses/Anzahl der Online-Zugriffe") but currently implemented next to the title "Statistics", as the box "Page access statistics" is not yet implemented.

If it is adjusted in #3394, I'll merge it hidden by the beta permission.

[JoeyStk]

I'll think about it on Tuesday :)

[JoeyStk]

Hmm, how should we go with the position of icon?

@MizukiTemma Can you not wrap inside the beta permission too? I'm imagining something like {% if perms.cms.beta %} ICON ... . Do you think this would work? :)