After a user invokes the ".topic" command and reacts with the reroll emoji, the embed will now show the previous few messages. It cannot display more than
256 characters, which is usually around 5 prompts.

Implements: python-discord#1145

Revert the extra whitespaces added by my formatter to meet the style guide.

This commit will remove some duplicate and unnecessary code, as suggested by @ChrisLovering.

Once the number of characters in the embed's title exceeds the limit of 256, the bot will remove the reroll emoji.

Suggested (here)[python-discord#1148 (comment)]

This commit changes the message to have a set title, then up to 3 topics, followed by a footer (currently link is broken).

This commit handles when a user presses the reroll emoji after it's already removed by the bot. It just returns what the embed was before and re-clears the reactions.

Because embed footers can't have markup, the topic suggestion hyperlink can't be in it. This commit moves it from the footer to the description of the embed.