Add docs on how to host IndicSubtitler on your own

[kurianbenoy]

Is your feature request related to a problem? Please describe.

I'm not sure if I found any documentation on how to run the model locally, I used the Indic subtitler web app
https://indicsubtitler.in/ @kurianbenoy can confirm if this is right

Describe the solution you'd like

• Mention how you can run the model directly via localhost or via hosting as their own version of indicsubtitler.in. Suggesting Vercel and Model.com as stack