Remove older documentation pages?

[Datseris]

Continuing from #1174 , should we remove older documentation pages that refer to versions before v6? In principle docs can be recreated locally by downloading a specific tag and building the docs yourself, so I am not sure how much merit there is in keeping all versions online.

Advice by Anshul on slack on how to do this:

1. To remove tags from the docs, simply delete the corresponding folder in your gh-pages branch
2. To remove pages from being indexed by google search you could try https://developers.google.com/search/docs/crawling-indexing/block-indexing