Documentation for self-hosting with docker compose

[unteem]

Purpose

Make self hosting of Docs easier with an example of a deployment procedure with docker compose and document how to configure Docs.

While #583 propose an easy way to deploy Docs with docker and Make, here we describe more in details the various steps and requirements to deploy Docs.

Proposal

• example to deploy and configure keycloak
• example to deploy and configure minio
• example to configure proxy and certs
• example to deploy and configure Docs

Improvements

• Rephrase description of environment variables and categorize
• Use template for nginx conf

Fixes #561
Supersedes #583

A one liner quick start could be a nice addition:

• merge all services in a single compose
• scripts to generate secrets

[lunika]

you commits does not have a description. It is useful to add it to explain why you made the modification about the env.md file for example.

[mustafa0x]

This commit will make docs more accessible to a huge number of teams. Eagerly waiting to see it committed!

[unteem]

Thanks for the reviews, should be good now.

@lunika I removed the commits that change env.md and will make another PR of those changes make sense. I think its better to split it.

[virgile-dev]

How about we keep an installation.md at the root of the /docs folder where we can list the different deployment option (K8S, Compose and NIX) ?

[virgile-dev]

Let's merge this and make documentation for different deployment solution more homogeneous in a next PR.

[virgile-dev]

@unteem can you make the last test pass so we can merge this please ?