By George he's got it
Well, it looks as if I’ve finally (accidentally?) stumbled upon the right settings for my DNS registrar and my Github pages, to get my personalised domain name (godspell.org.uk) to point to the Github page.
It would help if I actually read the various online guides and advice pages. It would help even more if they were easier to understand. For example, if they explained (or if I had been able to look up) what a CNAME or A or AAA record was. I’m still not sure just what they all mean. But at least it looks as if it’s working.
I wonder if I’ll be able to remember how it’s done, the next time I have to do anything like it?