Discord params descriptions

[MartinKolarik]

The UI descriptions are currently in deploy-commands.ts and are very brief (no mention of defaults, etc). I think it would make sense to extend help.ts with another field like shortDescription, which would contain the text used for Discord. It would be easier to keep it consistent with both texts being in the same place.

Discord limit is 100 characters, for a start, please add shortDescription for each option based on description (not based on what we currently have in the discord file). For descriptions that are too long, try to shorten it to < 100 characters yourself, I'll adjust it later if needed.