[User Story] As a developer, I want to be able to make issue references inside project channels

**Given...**
Given I accept the bot to overwrite my messages with issue references (by a command like `c!github iss-ref true`)

**When...**
When I send a message with a issue reference in a project channel.

> We shall fix #69 and merge #70 quickly

**Then...**
Then the bot copy my message, deletes it and resend referencing the issue. (using a hyperlink)

> [{user}]: We shall fix [#69]\(https://github.com/Code2Gether-Discord/{channel}/issue/69) and merge [#70]\(https://github.com/Code2Gether-Discord/{channel}/pull/70)