Fix layoutpages layout

[tvdeyen]

What is this pull request for?

We rebuilt the sitemap with flexbox but forgot to update the layoutpages as well.

Also rebuilts node tree with flexbox

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.80%. Comparing base (c5172b4) to head (38e15d4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2780 +/- ## ======================================= Coverage 95.80% 95.80% ======================================= Files 221 221 Lines 6078 6078 ======================================= Hits 5823 5823 Misses 255 255 ```

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