Can I include a page in the header, for easier navigation to that page? Kind of like creating a navigation bar?
We have a plugin which with you can include a navigation on top. It's called Navigation Menu Editor. You can integrate the navigation into the surface and go directly to important pages.
Here is the link for you to take a look at it: https://info.seibert-media.net/display/Atlassian/Navigation+Menu+Editor+-+Confluence+Plugin