This adds the possible semi-automatic upgrade procedure.

Refs. swh/infra/sysadm-environment#5389

With the current static cluster.

Refs. swh/infra/sysadm-environment#5415

Split the main architecture picture in 3 parts: read access, ingestion
and indexation. Keeping everything in one big picture is not really
possible any more.

Refs. swh/infra/sysadm-environment#5417

following the migration to cassandra as main backend.

Refs. swh/infra/sysadm-environment#5399

so that we can add mermaid graphs in the documentation easily.

It's no more managed by puppet but was migrated
to kubernetes

Related to ingress-objstorage-ro-auth-secrets.yml

swh-search requires yarn to be installed or its installation fails
so make the nodejs and yarn installation steps mandatory.

There is no longer issues with new pip resolver so we can remove that note.

Installation of mypy with the correct version is already handled
by the bin/install script.

Refs. swh/infra/sysadm-environment#5397

Refs. swh/infra/sysadm-environment#5397

Refs. swh/infra/sysadm-environment#5397

Refs. swh/infra/sysadm-environment#5396

Related to swh/infra/sysadm-environment#5386

Refs. swh/infra/sysadm-environment#5344

Refs. swh/infra/sysadm-environment#5344

Refs. swh/infra/sysadm-environment#5344

Related to swh/infra/sysadm-environment#5365

Refs. swh/infra/sysadm-environment#5344

and bump the advertised minimal python version to 3.10

Refs. swh/infra/sysadm-environment#5315