tour: absolute links so they work in offline tour #213
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Lots of links in the tour use origin-relative links on the assumption they will be used at "https://go.dev/", which works out badly if the tour is being used offline. Links inside of "#appengine:" don't need to be updated as they will be running inside the normal location. Also don't have to update links starting with "/tour" as they will work in the offline and appengine modes.
I did consider updating the links to the place they currently redirect for links like "https://go.dev/pkg/builtin" which ends up at "https://pkg.go.dev/builtin" but it is redirecting with 307 Temporary Redirect (unlike the 301 Moved Permanently "https://golang.org/" gets) so I avoided those updates.
Update origin-relative links that will appear offline to be absolute https://go.dev links.
Fixes golang/tour#1463