[FEATURE]: Complete documentation version automation script

[elevran]

documentation versioning is mostly automated. The following steps are still manual:

• order of [param.versions] array correctly (main, new version, previous version, ...). The use of sed seems limited for this and go-toml packages do not handle comments ;-(

• add (git) release version to script parameters so it can be auto updated as well

• auto update the docs/${NEW_DOCS_VERSION}/_index,md file's frontmatter from its use of main related strings to new version

• [x] If the feature request is approved, I would be willing to submit a PR