/usr/share/icingaweb2/modules/doc/application/ is in icingaweb2-module-doc 2.1.0-1ubuntu1.
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/usr/share/icingaweb2/modules/doc/application/controllers/
/usr/share/icingaweb2/modules/doc/application/controllers/IcingawebController.php
/usr/share/icingaweb2/modules/doc/application/controllers/IndexController.php
/usr/share/icingaweb2/modules/doc/application/controllers/ModuleController.php
/usr/share/icingaweb2/modules/doc/application/controllers/SearchController.php
/usr/share/icingaweb2/modules/doc/application/controllers/StyleController.php
/usr/share/icingaweb2/modules/doc/application/views/
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/usr/share/icingaweb2/modules/doc/application/views/scripts/index/
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/usr/share/icingaweb2/modules/doc/application/views/scripts/module/
/usr/share/icingaweb2/modules/doc/application/views/scripts/module/index.phtml
/usr/share/icingaweb2/modules/doc/application/views/scripts/pdf.phtml
/usr/share/icingaweb2/modules/doc/application/views/scripts/search/
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/usr/share/icingaweb2/modules/doc/application/views/scripts/style/
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/usr/share/icingaweb2/modules/doc/application/views/scripts/style/guide.phtml
/usr/share/icingaweb2/modules/doc/application/views/scripts/toc.phtml