Feature Request: Truncate Unfurl Description

For long descriptions, the unfurls don’t look good in Slack.

IMO we can truncate the description to a fixed number of characters. If truncated, an ellipsis “…” can be added at the end.

It looks like Slack does this now, but there are too many characters for comfort.

300 characters feels like a good limit.

This is done. Unfurl descriptions are now truncated to 300 characters.