3.5.0 is trending above stable in google search

[jklymak]

3.5.0 somehow does not have the "canonical" links in the header, so it is not often trending above stable in google search. Probably worth running the script to fix this?

New pages (3.5.1, and those on 3.5.2) have the correct canonical, as do all the old ones....

3.5.1 and 3.5.0 do not have a "old version of Matplotlib" banner, however. Do we want that?

[QuLogic]

Oh, I had fixed this about a month ago, b252859, but the server was on the wrong branch and so didn't refresh. We should be preferring stable again now.

[QuLogic]

I re-ran the script, but it only updated some old/incorrect redirects and did not add a banner to 3.5.0/3.5.1; maybe there was a change in the theme and it no longer finds its insertion point?

[jklymak]

Search results are all topped by stable again! I think we can close this....