Bring back archived remote API versions

- git mv archived/* .
- put the links back into the summary document
- reduce the header depth by 1 so the TOC lists each API version
- update the mkdocs.yaml to render the archived API docs, but not add
  them to the menu/nav

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5517 from SvenDowideit/5267-make-archived-docs-hidden-but-linkable

Bring back archived remote API versions
make sure the intermediate index.html files are generated consistently

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)