Remove next documents in favor of two releases at a time.

[TerryHowe]

Maintaining 3 copies of the documents will be very difficult making sure fixes happen for each version. This PR reduces the number to 2. We can use the latest release at the basis for the next new release.

[asmitbm]

I'm not sure if Docusaurus recommends removing the main docs from the /docs folder. Instead, we can rename the Next docs to match the current version we're working on and keep the last version.

[TerryHowe]

It seems to work fine from the preview.

[asmitbm]

It seems to work fine from the preview.

Yes, it does, but when we need to create new versioned docs, we'll need the source docs located in the /docs folder.

Ref: https://docusaurus.io/docs/versioning#tagging-a-new-version

[TerryHowe]

That is really just a process.

I'm not opposed to having docs be latest i.e 1.2 right now, but I'd like to have no more than 2 copies of the docs normally.

[qweeah]

LGTM although IANAM

IMHO, it's better to use a dedicated branch to track the doc of next version.

[TerryHowe]

Based on the discussion in the meeting this week, people are in favor of having all the docs in the versioned_docs directory so it is clear what they are. People are also in favor of the 2 versions max idea. The site works fine without a docs directory.

[FeynmanZhou]

LGTM. It avoids ambiguity to just keep the versioned doc folder per our discussion in the meeting.