fix(doc-links test): improve test to get list of broken links

[kimanhou]

Done

• fix(doc-links): improve the test that checks in all documentation links exist and are healthy

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @Kxiru or @edlerd for access.
   • With a local copy of this branch, build and run as described in the docs.
2. Perform the following QA steps:
   • At the of opening this PR, the docs seem broken in LXD latest edge so the test should fail and log the full list of broken links with their status

    Error: Found 26 broken documentation links:
   [501] /explanation/authorization
   [501] /explanation/authorization/#use-groups-defined-by-the-identity-provider
   [501] /explanation/clustering/
   [501] /explanation/clusters/#member-roles
   [501] /explanation/networks/
   [501] /explanation/storage/
   [501] /explanation/storage/#storage-buckets
   [501] /explanation/storage/#storage-pools
   [501] /explanation/storage/#storage-volumes
   [501] /howto/cluster_placement_groups/
   [501] /howto/container_gpu_passthrough_with_docker/#container-gpu-passthrough-with-docker
   [501] /howto/instances_create/
   [501] /howto/instances_create/#instances-create-iso
   [501] /howto/network_acls/
   [501] /howto/network_forwards/
   [501] /howto/network_ipam/
   [501] /howto/network_ipam/#view-dhcp-leases-for-fully-controlled-networks
   [501] /howto/network_ovn_setup/#set-up-a-lxd-cluster-on-ovn
   [501] /howto/oidc
   [501] /howto/oidc/
   [501] /howto/storage_backup_volume/#storage-backup-snapshots
   [501] /howto/storage_buckets/#manage-storage-bucket-keys
   [501] /reference/devices_gpu/#devices-gpu
   [501] /reference/instance_options/#instance-options-snapshots-names
   [501] /reference/storage_btrfs/#quotas
   [501] /reference/storage_dir/#quotas

[webteam-app]

Demo

Jenkins

demos.haus

[kimanhou]

The test fails because it claims the documentation page explanation/authorization returns a 501 Not Implemented error:

Error: ✗ /explanation/authorization - NOT FOUND (501)

But the page does exist

[omarelkashef]

LGTM, thank you for fixing the test!