Broken links after #1366

[tsmbland]

A couple of links are broken after merging #1366, so the link checker is failing on main

• https://energysystemsmodellinglab.github.io/MUSE2/v2.1.0//model/prices.html
• https://energysystemsmodellinglab.github.io/MUSE2/api/muse2/

[tsmbland]

@AdrianDAlessandro Would you mind looking at this?

[dc2917]

Link in this section is failing, presumably related:

For more information, consult the documentation for the units module.