Add Hindi, Sanskrit and Telugu, ISO 639-1 Codes: hi, sa, te

[SergeCroise]

Prerequisites:
Hindi (हिन्दी), Sanskrit (संस्कृतम्) and Telugu (తెలుగు) are supported by MkDocs:
https://squidfunk.github.io/mkdocs-material/setup/changing-the-language/

Todos:

• update crowdin.yml (todo)
• grant access to hi, sa, te, (es) in Crowdin (translator and proofreader)
• update mkdocs.yml (todo)
• translate e.g.: https://crowdin.com/editor/rockydocs/523/en-es
  or https://crowdin.com/editor/rockydocs/15/en-es

See also:
https://crowdin.com/project/rockydocs/hi
https://crowdin.com/project/rockydocs/sa
https://crowdin.com/project/rockydocs/te
and
https://crowdin.com/project/rockydocs/activity-stream
https://crowdin.com/project/rockylinuxorg/hi

What the heck...
https://en.wikipedia.org/wiki/Languages_of_India