Creating a main "hub" for componentized documentation

I have integrated Doxygen documentation generation into CMake via tag
files. Each dependency on a library introduces a tag file dependency.
So far all of this is going great; but there's no "central" landing
page that connects everything together.

What would be the best way to manage a central / main page of sorts to
connect multiple index.html together? Note I found a really old answer
that seems to touch on this over at stackoverflow:

https://stackoverflow.com/a/11582562/157971

However there is not very much detail on the layout.xml idea.

What I plan to do is have our CI build server generate all
documentation each night and push the entire documentation tree to an
apache server. Ideally I could send out 1 URL to everyone that they
can use to reach all documented components.

Advice is appreciated!

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