Add titiler service

[weiji14]

What I am changing

• Add titiler service and update some docs

How I did it

• Copy titiler service YAML config from docker-compose.yml to deploy/vbos/docker-compose.yml, changing port mapping from 8002:8000 to 8000:80.
• Update some docs in the README.md files

How you can test it

• Run docker compose -f deploy/vbos/docker-compose.yml up --build vbos-backend titiler locally, and check that http://localhost:8000 page show Titiler

Related Issues

Closes #13

[geohacker]

@weiji14 thank you for getting this PR started. I made the following changes:

• Put back the titiler in docker-compose.yml — this is used for local dev and we shouldn't remove. The deploy/ docker compose file is only used for deployment.
• Use titiler command to run the service and adjust port
• Add caddy labels for domain and point DNS in our route53

[weiji14]

Thanks for setting up the caddy networking stuff. I'll merge this in now 🚀