feat: Replacing Juju bundle with Terraform module in Getting Started tutorial

[Gmerold]

Description

Updates the Getting Started tutorial to use Terraform modules instead of Juju bundle for Charmed 5G deployment.

Successful run depends on merging this fix.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that validate the behaviour of the software
• [x] I validated that new and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have bumped the version of the library

[markbeierl]

Do we want to update the picture as well?

[markbeierl]

Re-running Terraform will revert the change for the external_hostname:

Terraform will perform the following actions:

  # module.sdcore.module.traefik.juju_application.traefik-k8s will be updated in-place
  ~ resource "juju_application" "traefik-k8s" {
      ~ config      = {
          - "external_hostname" = "10.0.11.4.nip.io" -> null
            # (1 unchanged element hidden)
        }
        id          = "sdcore:traefik"
        name        = "traefik"
      + principal   = (known after apply)
        # (4 unchanged attributes hidden)

        # (1 unchanged block hidden)
    }

We should change the tutorial to make this modification via TF instead of directly against Juju

[Gmerold]

Do we want to update the picture as well?

Done.

[Gmerold]

Re-running Terraform will revert the change for the external_hostname:

Terraform will perform the following actions:

  # module.sdcore.module.traefik.juju_application.traefik-k8s will be updated in-place
  ~ resource "juju_application" "traefik-k8s" {
      ~ config      = {
          - "external_hostname" = "10.0.11.4.nip.io" -> null
            # (1 unchanged element hidden)
        }
        id          = "sdcore:traefik"
        name        = "traefik"
      + principal   = (known after apply)
        # (4 unchanged attributes hidden)

        # (1 unchanged block hidden)
    }

We should change the tutorial to make this modification via TF instead of directly against Juju

True. Done.