Self-host a Nominatim Service

[Krishna-Sivakumar]

Self-hosting a Nominatim service will help us cut down on time wasted doing API calls.
Map building takes the most time. And right now, most of the time while building the map is spent on doing 2 API calls to a public Nominatim service per tweet, which adds a lot of latency.

Since we already have a docker build, it doesn't hurt to add one or two more containers to our deployment.

Links to refer:
https://github.com/mediagis/nominatim-docker
https://nominatim.org/release-docs/latest/admin/Installation/

This will help us shift to a dynamic backend in the long run.

[DomiiBunn]

Needs code changes as well not just compose