Update config stub management from OSIT ACCESS workshop meeting

[chrisb13]

As discussed at workshop @chrisb13 @anton-seaice @minghangli-uni @atteggiani @aekiss @dougiesquire

See design/discussion doc here.

[chrisb13]

Related: ACCESS-NRI/access-hive.org.au#908

(This was created such that this PR could be started)

[chrisb13]

As this comment, would be good to remove broken links (or ones that have a high potential to break in the future).