Remove any need to rely on IDs (and developer mode)

[eibex]

With commit 4830607 it is no longer necessary to use channel IDs, making the bot much more straightforward to use.

However, the edit command still relies on the message ID to fetch the embed that needs to be modified.

A possible solution is not to ask for the message ID, and have the bot reply with a numbered list of messages (maybe including just the title?) and the user simply needs to input the number to select the message to be edited. If there is only one reaction role embed in that channel, then this process could be probably skipped and select the only existing embed automatically.