Help in dedicated views is not based on flask-wiki package

[PascalRepond]

Bug description:

Search and some othe functionnalities of the SONAR help do not work when in a dedicated view.

The fixing of the following issue (#709) was poorly implemented with code from the flask-wiki package being copy-pasted directly into SONAR (see https://github.com/rero/sonar/tree/staging/sonar/help). When upgrading flask-wiki, the code in SONAR becomes deprecated and breaks.

Expected behavior:

• The integration of flask-wiki in SONAR should only use the flask-wiki package.
• Accessing the help from a dedicated view should not bring us back to the main SONAR URL but should stay in the dedicated interface.

Steps to Reproduce:

1. Go to FOLIA
2. Click on "Help/documentation"
3. Try to search inside of the help module
4. See error https://folia.unifr.ch/unifr/help/search?q=ad

• Versions: v1.10.1