If you are using a custom theme you can edit the Space Layout directly. It requires a bit of knowledge around use of velocity templates and a bit of html. We have the document on how to how to do this below.
if you are using a documentation theme: https://confluence.atlassian.com/display/DOC/Configuring+the+Documentation+Theme#ConfiguringtheDocumentationTheme-CustomisingtheDocumentationtheme
search this page for "customizable header"
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