Bug fixes

After a change in the OOP hooks, the install hook didn't work anymore. This has been fixed.

Makes sure creating new site settings is bolted down based on existing settings (multiple or not, check for an identical domain context site setting)

• #3511020: Config form arguments error
• #3313062: Use attributes from link field ?

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Enable compatibility with all future versions of dependencies in the Composer file.

Warning: this version is missing something, so you should use the next version instead.

1. Remove indentation in the body of the page and hide links.
2. Enable compatibility with all future versions of dependencies.
3. Add logo.