Subsystems documentation

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dependencies
settings
html-css
events-system
sending-messages
notifications
queuing
pointer
markdown
caching
performance
realms
management-commands
schema-migrations
hashchange-system
emoji
hotspots
full-text-search
email
analytics
client
logging
typing-indicators
django-upgrades
release-checklist
api-release-checklist
input-pills
presence
unread_messages
billing
widgets
slash-commands