docs: support different languages (i18n)

[nitrocode]

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• I'd be willing to implement this feature (contributing guide)

Describe the user story

Allow documentation to be written in other languages such as Spanish.

This is also known as i18n or internationalization.

Suggested by @jamengual

Describe the solution you'd like

Vuepress, the backend for runatlantis.io, supports i18n. See this document.

https://vuepress.vuejs.org/guide/i18n.html

Once i18n scaffold is set up, that's when additional languages, such as Spanish, can be supported

Describe the drawbacks of your solution

None

Describe alternatives you've considered

None