Create public facing documentation for configuring Dex connectors

[DnPlas]

Context

A piece of public documentation is required to explain how to use Dex connectors with the dex-auth charm.

The document should allow users to understand:

• What are connectors?
• When a connector is needed?
• Why a connector is needed?
• How to configure a connector with dex-auth?
• How to configure connectors from Azure

What needs to get done

Write a How to guide to expose the information from the description.

Definition of Done

There is a public how to guide in https://charmed-kubeflow.io/docs that solves all the questions posted in the description.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6074.

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[DnPlas]

Originally, this task was meant for creating a guide so we could expose the different configurations for Dex. That is, through a "how to use Dex connectors", we would expose the connector and dex-issuer-url configuration options, but potentially we could revamp this piece of docs and instead do a more clear guide for how authentication works for Charmed Kubeflow, including how Dex can be configured to use IdPs other than Dex (Azure, LDAP, Github, etc.).