Add IRCafe to desktop clients - #601

Changed pages include:

• docs/sasl-mechs.html - view
• software/clients.html - view
• specs/client-tags/channel-context.html - view
• specs/client-tags/react.html - view
• specs/client-tags/reply.html - view
• specs/client-tags/typing.html - view
• specs/extensions/account-notify.html - view
• specs/extensions/account-tag.html - view
• specs/extensions/away-notify.html - view
• specs/extensions/batch.html - view

There are more changes not included in the list