[Feature] Support documentation versions

[chipzoller]

I have checked all the prerequisites below and I'm yet experiencing a problem

• Read the README.md
• Have the extended version of Hugo installed
• Used the exampleSite's config.toml as a reference

Describe the feature

Especially for software projects, companies/communities often need to maintain documentation for separate versions especially as documentation is now fairly standard to store in git. Consider supporting versioning documentation similar to how some other themes do it (for example Docsy).

Desktop (please complete the following information):

• OS: N/A
• Browser: N/A