Use Embed.timestamp for the !remind command

[ToxicKidz]

Description

This PR makes it so that when you the use !remind command, the success embed sends the date in the embed's timestamp, and not in the footer. This is so that the time can update how discord formats it, and so that it will convert to your local timezone. This closes #1536.

[kwzrd]

Here is the current output:

I think that's pretty good, if grammatically a little awkward. I think the original wording ~

~ reads somewhat better to me, but maybe it's not as direct in what it's trying to convey. What do you think?

[ToxicKidz]

I wasn't sure if Due • 10/20/21, but now thinking about it, it looks fine. I'm just not exactly sure if people would understand it with • in the middle.

[kwzrd]

Yeah, perhaps what you have will be the easiest to understand. I don't feel strongly either way.

[Akarys42]

Lgtm, thanks!