The `da` tool has not existed for a while now and it's unlikely any new
user will need to know about the upgrade path. I think starting from
1.2.0 it makes sense not to have that documenation around anymore.
Note that we do have references to the upgrade page in the release
notes, so leaving them as is would break building the documentation. My
preference would have been to turn those references into "external"
links to the relevant version, but unfortunately, these are versions
(`0.12.15` and `0.12.18`) that, for various reasons, we cannot build
anymore and do not have in pre-built form. I have therefore decided to
change the links in the release notes to link to the latest existing
version of that page (which is pretty much what it already did), i.e.
specifically link to `1.1.1`.
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