swh/c4: Attempt to document sysadmin part of swh-coarnitify

vsellier/swh-c4-model/docs/coarnotify/.adr-dir

vsellier/swh-c4-model/docs/coarnotify/adrs/.adr-dir

vsellier/swh-c4-model/docs/coarnotify/adrs/0001-pipeline.md

.../swh-c4-model/docs/coarnotify/adrs/0002-authentication.md

vsellier/swh-c4-model/docs/coarnotify/adrs/0003-hostnames.md

...wh-c4-model/docs/coarnotify/adrs/0004-queue-management.md

...r/swh-c4-model/docs/coarnotify/adrs/0005-rate-limiting.md

...r/swh-c4-model/docs/coarnotify/adrs/0006-metadata-type.md

vsellier/swh-c4-model/docs/coarnotify/coarnotify.md

vsellier/swh-c4-model/workspace.dsl