[ANSWERED] editing header?

As a developer I would like to know where to go (which header files to edit) to make the piwik stats pages blend into my site (ie rebranding). Also, any way to remove/edit the “Piwik is a collaborative project and still Beta. If you want to help, please…” text for normal users. Thank you for help in advance.

[edit: see Build "theming" feature in Piwik. · Issue #5597 · matomo-org/matomo · GitHub and Allow customizing the Piwik logo · Issue #2008 · matomo-org/matomo · GitHub – vipsoft]

You’ll probably need to edit this file: