Some transcripts are too long for discord mesages

[Hpmason]

Some transcripts are too long to be sent as a description in an embed (2048 characters). Transcript should be split up into multiple embed "fields" or separated altogether. Currently no response is sent through discord, as the content exceeds the discord's character limit.

Example(s) found to test against:

• Comic 442

Things to note:

• This is different from the embeds created from the !explain command
• The transcript content the bot sends is different from the transcript provided by xkcd's JSON file because we modify the their markdown to discord's markdown.

Steps needed to take:

1. After converting the transcript markdown to discord markdown, check content length.
2. If content length is greater than 2048 characters, change the output to multiple fields using the field or fields method. Fields can only be 1024 characters long, so a message over the 2048 limit would need 3 fields