Backport of !838

Marius Burkardrequested to merge
cherry-pick-ea9f8ef6 into develop

Add website_symlink_plugin.inc.php

See merge request !838 (merged)

(cherry picked from commit ea9f8ef6)

2cd49f48 Add website_symlink_plugin.inc.php f9626973 Update website_symlink_plugin.inc.php

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