switch version in the api docs

[s-cork]

switch version in the api docs

[nicolaskruchten]

There is not, no, but our API is largely backwards-compatible back to 3.0 with only the changes listed in https://plotly.com/python/v4-migration/

[s-cork]

I wanted to re-open this.
Context - we currently use python version 4, and are often a version behind plotly latest.

Whilst being largely backward compatible is useful.
Not having access to api docs of previous versions can be frustrating at times.

For example, a user just pointed out that fillpattern doesn't work in our plotly implementation.
This is documented in the API docs.
But there's no obvious place I can point the user to and say:

• yes but fillpattern isn't available in version 4, it was only added in version 5

Having a version switch in the website documentation would be so helpful for this kind of use case.