fix: stay on page after version switch (hanoi)

[farshidtz]

Same as #679 but for Hanoi.

Related to #678

This fixes the version switch from version 1.3 to others, but not vice versa.

It also removes the obsolete versions, index, cname from this branch; see #680

PR Checklist

Please check if your PR fulfills the following requirements:

• Changes have been rendered and validated locally using mkdocs-material (see edgex-docs README)

[farshidtz]

@jpwhitemn @lenny-intel
The CI checks fails due to this unrelated deprecation warning:

Config value: 'google_analytics'. Warning: The configuration option google_analytics has been deprecated and will be removed in a future release of MkDocs. See the options available on your theme for an alternative.

Should we close without merging and skip these fixes for hanoi?

[lenny-goodell]

Should we close without merging and skip these fixes for hanoi?

IMO, we should skip since Hanoi is a 1.x release.

[farshidtz]

It's a pity that we can't get this and #684 merged. Google is indexing 1.2 first and users landing there won't easily find their way to the latest versions of pages.

[farshidtz]

#819 has fixed the issue preventing the merging of this PR, but also overrode and broke the version master version file that this PR is trying to fix. We should be able to merge this now.

[MonicaisHer]

@farshidtz Thank you for the changes.