Hebbot reacts to commands in admin room

[thibaultamartin]

Hebbot adds a ✔️ reaction to commands in the admin room when it successfully executed it
Hebbot adds a ❌ reaction to commands in the admin room when it failed to execute it

[haecker-felix]

That is no longer necessary, each command generates a feedback message with an ✔️ or ❌ emoji at the beginning.