Add content to Confluence pages via Slack post with annotation

[Martyna Balcerowska]

It would be great if there was a possibility to add content to already created Confluence pages directly form Slack integration.

I think of the scenario where:
1. I have eg. `Status` Confluence page created
2. I add status post on Slack (standard team communication) with some kind of annotation (eg. mention or hashtag like @{confluence page url})
3. Slack post content is added as a new section on the bottom of the mentioned confluence page

This way we could build the documentation on confluence without extra effort of copy-pasting the content. In this way it would be possible to share it with other stakeholders that o not have access to particular slack channels.