Update mkdocs.yml to fix link problem

[chrisb13]

Closes: #250 (if works)

As suggested by @atteggiani here: #250 (comment)

[github-actions]

PR Preview
🚀 Preview of PR head commit 16eb973 deployed to https://access-nri.github.io/access-esm1.6-configs/pr-previews/252
2026-04-17 11:24 AEST
Preview generated through the Deploy to GitHub Pages workflow run 24542856443.

[chrisb13]

Thanks @atteggiani

[ccarouge]

I've added the plugin to the requirements.txt file so that it now builds fine.

[ccarouge]

@Whyborn this is now building fine for the preview. Please check it solves the issue #250

[Whyborn]

I think it resolves the fundamental problem, which was incorrect resolution of absolute links, but the Inputs and Configuration/Configuration choices pages still lead to 404s, just because the links in the top index.md are incorrect (There is no /inputs/Forcing-data-models nor /configurations/Overview). Not sure if you want to fix this here, as it's a different problem.

[ccarouge]

(There is no /inputs/Forcing-data-models nor /configurations/Overview). Not sure if you want to fix this here, as it's a different problem.

I would leave this to a PR updating the Home page.

[Whyborn]

With the caveat that the remaining broken links (which are broken due to pages actually not existing, rather than absolute links not being resolved) will be fixed in a later PR, this looks fine to me.