Integrate Beslishulp into AK as a modal

[ravimeijerrig]

Description

Currently, the AK contains a link that opens the decision tree in a new tab. We want to replace this with a modal implementation similar to AMT, which includes:

• Opening the decision tree in a modal window instead of a new tab
• Implementing automatic requirement filtering upon closing the modal
• Implementing designs as
• Automatically filtering the requirements when the modal is closed via the button.

Designs

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Implementation notes

• The AI Act labels are stored both in the decision tree session storage and in the vereisten metadata in AK.

• All non-AI Act requirements are always displayed, they don't have any ai-act-labels in the metadata.

• Can use logic from #323 that is implemented in AMT on how vereisten are filtered from the decision tree modal.

• There is no back-end in this system. Dependent on data-html label that shows the labels from the metadata from the mkdocs of the requirements. They can be processed as hidden-data-fields.

• Add logo and restart button in HTML. Make sure pop-up styles override the default ones (need to check which ones to change), and fix font problems by adding font settings to index.js since fonts weren't showing up in the pop-up.

• Fix high-risk label