Add first draft for info on extensions

[bencomp]

Closes #191. Also closes #177 as this is the last sub-issue tracked by that issue.

I'm not happy about the wording yet, but wanted to suggest a first draft.

Extensions do more than what I explain in the body and in the key point at the end, but since that may change over time, I don't want to list all the potential functionalities that extensions could add or improve. @ostephens mentioned that the LC lesson has a section on extensions, but that feels too thin on information.

I summarised the discussion on adding info on extensions and alternate distributions in #177. It looks like alternate distributions are no longer featured on the OpenRefine website, so I would not bring them up.

I would love to hear from @marijane or @ostephens whether you think this is enough information. If so, I can rewrite it into easier to read text. (Or take your wording suggestions :))

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:stopwatch: Updated at 2025-10-08 16:30:31 +0000