Resolve "k3s.yml can be broken by running the playbook several times"

Closes #1014

See merge request stackspin/stackspin!861

Fixes: #1014

Mitogen seems dead (last release Dec 2020), and ansible-core 2.9.x is EOL
in May 2022 (https://docs.ansible.com/ansible/devel/reference_appendices/release_and_maintenance.html#ansible-core-changelogs).

Resolve "Installation try out"

See merge request stackspin/stackspin!860

edit install_stackspin.rst to make it harder to skip steps. Also add (re)activating your virtualenv to those instructions

move all provisioninig machine prerequisites into one place, make distinction between provisioning and VPS clearer

Resolve "Add stackspin theme for documentation"

Closes #1157

See merge request stackspin/stackspin!857

Resolve "Add mem limits/requests to zulip rabbitmq and redis pods"

Closes #1156

See merge request stackspin/stackspin!853

V0.8beta1

See merge request stackspin/stackspin!848

Resolve "Upgrade zulip postgres to v14"

Closes #1143

See merge request stackspin/stackspin!854

Fixes: #1143

Resolve "Fix nextcloud-onlyoffice InfoInhibitor alerts"

Closes #1155

See merge request stackspin/stackspin!855

Update Helm release nextcloud-onlyoffice to v0.7.4

See merge request stackspin/stackspin!851

Update Helm release wordpress to v0.6.3

See merge request stackspin/stackspin!852

Update Helm release mariadb to v10.3.7

See merge request stackspin/stackspin!850

TRIGGER_JOBS=enable-monitoring,enable-nextcloud,enable-velero,enable-wekan,enable-wordpress,enable-zulip