Fix documentation page sidebar bug

[jorund1]

A documentation page is included in two TOCs, which seems to cause some anomalies.

Currently, this howto-page appears to be listed under 'Reference material' instead of 'Howtos' in the sidebar.

This PR fixes this anomaly by making sure it is only listed in the 'Howtos' TOC.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.76%. Comparing base (237e1b6) to head (10a6ed3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3327      +/-   ##
==========================================
- Coverage   60.79%   60.76%   -0.03%     
==========================================
  Files         606      606              
  Lines       43794    43794              
  Branches       48       48              
==========================================
- Hits        26623    26610      -13     
- Misses      17159    17172      +13     
  Partials       12       12              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud