May I link to my website (the project home or my blog) page which contains diagrams etc. context specifying data (which is definitely useful to attach to a question but hardly optimal to rewrite into a question body)? Isn't it considered an advertisement?
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As long as it is truly on topic and truly helpful, yes this is fine. Be sure to clearly state that it is your own website.
I would post a brief summary of the information in the answer, and then post the link for "more information".
I agree with @Jon B. I would do something like:
The following post on my website explains in detail what you're trying to do. To summarize that post: