first commit to move everything to its own kustomization, also removes deprecated value from kustomizations

Resolve "Update flux"

Closes #1048

See merge request stackspin/stackspin!634

Update dependency kubernetes to v20

See merge request stackspin/stackspin!651

Update Helm release metallb to v2.5.13

See merge request stackspin/stackspin!650

Update Helm release ingress-nginx to v4.0.12

See merge request stackspin/stackspin!649

We need helm 3.7 because some charts we use make use of a helm 3.7 feature
(subchart values).
See stackspin/stackspin#1048 for more
details.

Closes: #1048

TRIGGER_JOBS=enable-monitoring,enable-nextcloud,enable-single-sign-on,enable-wekan,enable-wordpress,enable-zulip

Update dependency sphinx to v4.3.1

See merge request stackspin/stackspin!644

Update Helm release metallb to v2.5.12

See merge request !645

Related: #1057

Resolve "Use production certs in CI"

Closes #1043

See merge request !640

Update dependency paramiko to v2.8.1

See merge request !646

Update Helm release ingress-nginx to v4.0.11

See merge request !641

Update Helm release kube-prometheus-stack to v21

See merge request stackspin/stackspin!643

Merge branch '1052-allow-nextcloud-plugins-bruteforcesettings-files_markdown-groupfolders' into 'main'

Resolve "Allow nextcloud plugins bruteforcesettings files_markdown groupfolders"

Closes #1052

See merge request stackspin/stackspin!639

document how I made the first admin user for Zulip

See merge request stackspin/stackspin!637

Resolve "Deploy dashboard chart with flux"

Closes #1044 and #1040

See merge request stackspin/stackspin!623

Update zulip image tag

See merge request stackspin/stackspin!638